Exhibit 99.1

[LOGO OF CEPHEID]

Cepheid
904 Caribbean Drive
Sunnyvale, CA 94089
Telephone: 408.541.4191
Fax: 408.541.4192

          CONTACTS:

          AT THE COMPANY:

          John L. Bishop                       John R. Sluis
          CEO, Cepheid                         CFO, Cepheid
          408-541-4191                         408-541-4191
          john.bishop@cepheid.com              john.sluis@cepheid.com

          AT FINANCIAL RELATIONS BOARD:

          Tim Grace                            Tricia Ross
          Media Contact                        Investor/Analyst Information
          312-640-6667                         617-520-7064
          tgrace@financialrelationsboard.com   tross@financialrelationsboard.com

                   CEPHEID REPORTS SECOND QUARTER 2005 RESULTS

     TOTAL REVENUES INCREASE BY 89% DRIVEN BY 93% INCREASE IN PRODUCT SALES
              GROSS MARGIN DOLLARS ON PRODUCT SALES INCREASE BY 94%

SUNNYVALE, Calif., August 4, 2005 -- Cepheid (NASDAQ: CPHD) today announced
financial results for the quarter and six months ended June 30, 2005.

Product sales for the quarter ended June 30, 2005 increased 93% to approximately
$20.2 million from approximately $10.5 million for the corresponding prior year
period while product sales for the six months ended June 30, 2005 increased 128%
to approximately $39.0 million from approximately $17.1 million for the
corresponding prior year period. The increase in product sales for the quarter
and six months ended June 30, 2005 as compared to the corresponding prior year
periods was primarily due to a 371% and 459% increase in reagent and disposable
sales, respectively.

Total revenues for the quarter ended June 30, 2005 increased 89% to
approximately $21.4 million compared to approximately $11.3 million for the
corresponding prior year period while total revenues for the six months ended
June 30, 2005 increased 121% to approximately $41.0 million from $18.5 million
for the corresponding prior year period. The increase in total revenue for both
the quarter and six months ended June 30, 2005 as compared to the corresponding
prior year period was due primarily to the increase in product sales. Contract
revenue of $0.7 million and $1.4 million for the quarter and six months ended
June 30, 2005 was primarily derived from the amortization of up-front license
fees in connection with the Company's collaboration with bioMerieux.

Gross Margin Dollars on product sales (total product sales less cost of product
sales) for the quarter and six months ended June 30, 2005 increased by 94% and
112%, respectively as compared to the corresponding prior year periods. The
gross margin percentage on product sales for the quarter ended June 30, 2005 was
consistent at 42% when compared to the corresponding prior year period and
decreased to 43% for the six months ended June 30, 2005 as compared to 47% for
the corresponding prior year period. The decline in gross margin on product
sales for the six months ended June 30, 2005 as compared to the corresponding
prior year period was due primarily to the amortization of up front license fees
and higher ongoing royalty costs associated with the Company's patent license
agreements entered into with Applera Corporation and F. Hoffman-La Roche Ltd in
the second and third quarter of 2004 as well as one time favorable pricing
achieved in the first quarter of 2004 which did not occur in the six months
ended June 30, 2005. Gross margin on product sales for the full year 2005 is
expected to be in the range of 43% to 45%. Previous guidance was for gross
margin on product sales to be in the range of 45% to 49%.

                                     -more-



                                        2

Net loss for the quarter and six months ended June 30, 2005 was approximately
$3.6 million, or $0.09 per share and $7.1 million, or $0.17 per share,
respectively, compared to a net loss of approximately $3.7 million, or $0.09 per
share and $7.9 million, or $0.20 per share, respectively, for the corresponding
prior year periods.

"The Company is continuing to show progress in developing the individual
segments of our overall business plan. Three ASR's were released during the
second quarter covering gene expression and bacterial targets. Two additional
ASR's for bacterial targets were released subsequent to the close of the
quarter. These releases bring the total number of ASR's currently available from
the Company to 10. In addition, a new general use PCR master mix product was
released for use in both our ASR and Industrial markets."

"Collaborations and CSR programs were initiated with the FDA for Salmonella and
E. coli O157:H7/STEC, the University of North Carolina for recreational water
testing of E. coli, Enterococcus, Vibrio, Bacteroides and the Public Health
Research Institute (PHRI) for Methicillin Resistant Staph aureus (MRSA) and
VRE."

"The biothreat program with the United States Postal Service (USPS) continues to
move forward with installation of Biohazard Detection Systems (BDS). At this
time over 800 BDS units have been installed. In addition, a significant testing
milestone has been passed with over 1,000,000 tests now having been run with no
false positives while simultaneously maintaining a very high level of
sensitivity. This result is equivalent to a specificity of greater than
99.9999%. This was achieved using our patented testing system that includes our
closed cartridge, with integrated automated sample processing."

"Subsequent to the close of the quarter, we made a significant addition to the
management team with the appointment of David Persing M.D., Ph.D., currently a
member of the Company's Board of Directors, to the position of Executive Vice
President, Chief Medical and Technical Officer. Dr. Persing is a noted authority
in the field of infectious diseases and he brings a unique combination of
practical clinical experience along with a familiarity of industry research and
development models, which should immediately benefit the team and our programs
in the Clinical, Biothreat and Industrial markets," stated John Bishop,
Cepheid's CEO.

2005 OUTLOOK

Commenting on Cepheid's outlook for the remainder of 2005, Mr. Bishop stated:

"Work is continuing on our BCR/ABL ASR product for use on the GeneXpert(R)
system and we continue to expect to initiate product shipments in the second
half of this year. Development of our initial FDA product for detection of Group
B Strep (GBS) continues on the GeneXpert system along with a second generation
version of GBS on the SmartCycler(R) system. We expect to simultaneously
introduce both products in early 2006 in Europe with subsequent release in the
United States. The key issue has been to insure optimization of the test
sensitivity in the GeneXpert system and to simultaneously make available a
product with the same level of sensitivity for our existing SmartCycler
customers. Our product for the detection of Enterovirus is also expected to
enter clinical trials this year."

                                     -more-



                                        3

"Research also continues on a GeneXpert version of MRSA and a second generation
MRSA test for the SmartCycler system. Both tests are expected to be
simultaneously released in 2006."

"We continue to expect deployment of BDS units to be completed in all 282 USPS
processing centers by the end of this year. As we have previously discussed, we
expect to continue to supply GeneXpert anthrax test cartridges to the USPS for
use in the installed base of BDS units. In this regard, we recently received an
Authorization Letter from Northrop Grumman for the purchase of 2.3 million
anthrax cartridges to be delivered over a 14 month period commencing in August
of 2005 and running through September of 2006. We have also announced our
development plans for an expanded biothreat product menu, which is expected to
include the following cartridge configurations in sequential order: 3 agent
cartridge including anthrax, Y. pestis and F. tularensis; 4 agent cartridge
including anthrax, Y. pestis, F. tularensis and Smallpox; 4 agent viral
cartridge including Ebola, Marburg, Crimean-Congo hemorrhagic fever (CCHF) and
Venezuelan equine encephalitis (VEE); 6 agent cartridge including anthrax, Y.
pestis, F. tularensis, Smallpox, Burkolderia, and Brucella; a 10 agent array
cartridge including anthrax, Y. pestis, F. tularensis, Smallpox, Burkolderia,
Brucella, Ebola, Marburg, CCHF and VEE."

"Our market focus will continue to be in the Clinical Genetic Assessment market,
along with the Biothreat and Industrial markets. In response to market demand,
we are expanding what was previously the Life Science market to a broader
Industrial market, which will encompass Food, Agricultural and Environmental
testing in addition to research use generally associated with the Life Science
market. As a part of this program, we recently participated in a head-to-head
third party evaluation of water tests for E. Coli and Enterococcus against other
competitors. Early indications are that the Cepheid tests, utilizing our
licensed Scorpions technology, will be found to be superior to the competitor
products. These water testing products are expected to be released for
environmental recreational water testing before the end of 2005."

"While we continue to make significant progress in product development, we are
also addressing issues associated with automated high volume production which
have negatively impacted our manufacturing gross profit margins. We expect to
make significant progress in resolving these issues by the end of this year.
However, we will be realizing less gross profit dollars on product sales than we
had previously expected in the near term."

"We also recently had our first Customer Corrective Action Notice involving a
software bug associated with our SmartCycler Diagnostic software. The Company
moved expeditiously to notify customers and has not received any indication of
adverse patient events. We do not expect this customer corrective action to have
any material financial impact to the Company."

"We reaffirm that we expect our 2005 product sales to be in the range of $80.0
million to $84.0 million, based on anticipated sales for the USPS program and
sales expected from other existing and new products. However, given the
near-term impact on our manufacturing gross margins, we are increasing our
expected 2005 net loss to be in the range of $12.0 million to $14.0 million or
$0.28 to $0.33 per share based on actual weighted average shares outstanding of
42.5 million as of June 30, 2005. Previous guidance was an expected 2005 net
loss of $9.0 million to $11.0 million or $0.21 to $0.26 per share. Our net loss
projections do not include any stock compensation expense associated with SFAS
123R for which mandatory implementation has been delayed until January 1, 2006
by the Securities and Exchange Commission."

                                     -more-



                                        4

As of June 30, 2005, the Company had $52.4 million in unrestricted cash and
marketable securities.

CONFERENCE CALL INFORMATION

Cepheid's CEO, John Bishop, and Senior V.P. and CFO, John Sluis will host a
conference call today at 4:30 pm (Eastern) to discuss Cepheid's financial
results, business highlights and outlook. The call will be simultaneously
broadcast over the Internet. Interested participants and investors may access
the teleconference call by dialing 800-366-7417 (domestic) or 303-262-2141
(international). There will also be a live webcast of the call on the Investor
Relations section of Cepheid's web site at www.cepheid.com. Web participants are
encouraged to go to the web site at least 15 minutes prior to the start of the
call to register, download, and install any necessary audio software.

After the live webcast, the call will remain available on Cepheid's website,
www.cepheid.com, through August 4, 2006. A replay of the conference call will be
available at 800-405-2236 (domestic) or 303-590-3000 (international) through
August 11, 2005; the conference ID is 11034949. The replay will be available
after 6:30 pm (Eastern).

ABOUT CEPHEID

Cepheid (Nasdaq: CPHD), based in Sunnyvale, Calif., is a leading developer,
manufacturer and marketer of fully integrated systems that enable genetic
assessment when and where it is needed. Founded in 1996, the company is
commercializing its technology and products worldwide for research, medical, and
industrial applications requiring assessment of the human genome, infectious
disease and biothreat agents. See www.cepheid.com for more information.

This press release contains forward-looking statements that are not purely
historical regarding Cepheid's or its management's intentions, beliefs,
expectations and strategies for the future, including those relating to future
product releases, product performance, future revenues, future margins, future
net losses and the status of the USPS BDS program. Because such statements deal
with future events, they are subject to various risks and uncertainties, and
actual results could differ materially from the company's current expectations.
Factors that could cause actual results to differ materially include risks and
uncertainties such as those relating to: the scope and timing of actual USPS
funding and deployment of the BDS; the occurrence of delays with respect to the
BDS, the rate of environmental testing using the BDS conducted by the USPS,
which will affect the amount of consumable products sold, and whether the BDS
performs to specifications; development and manufacturing problems, including
with respect to the GeneXpert system and reagents; the need for additional
licenses for new tests and other products and the terms of such licenses; our
ability to complete clinical trials successfully in a timely manner for products
to be marketed in clinical markets; our ability to successfully commercialize
our stand-alone GeneXpert system; lengthy sales cycles in certain markets; the
performance and market acceptance of new products; sufficient customer demand in
the Industrial markets; our reliance on distributors to market, sell and support
our products; the occurrence of unforeseen expenditures, acquisitions or other
transactions; our success in increasing direct sales; the impact of competitive
products and pricing; our ability to manage geographically-dispersed operations;
and underlying market conditions worldwide. Readers should also refer to the
section entitled "Risk Factors" in Cepheid's Annual Report on Form 10-K for 2004
and in its most recent quarterly report on Form 10-Q, each filed with the
Securities and Exchange Commission.

                                     -more-



                                        5

All forward-looking statements and reasons why results might differ included in
this release are made as of the date of this press release, based on information
currently available to Cepheid, and Cepheid assumes no obligation to update any
such forward-looking statement or reasons why results might differ.

(FINANCIAL STATEMENTS FOLLOW)

                                     -more-



                                        6

                                     CEPHEID

                 CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
                                   (Unaudited)
                      (in thousands, except per share data)



                                            Three Months Ended June 30,     Six Months Ended June 30,
                                           ----------------------------    ----------------------------
                                               2005            2004            2005            2004
                                           ------------    ------------    ------------    ------------
                                                                               
Revenues:
  Instrument sales                         $      7,262    $      7,720    $     13,621    $     12,584
  Reagent and disposable sales                   12,942           2,749          25,334           4,533
                                           ------------    ------------    ------------    ------------
     Total Product Sales                         20,204          10,469          38,955          17,117
  Contract revenues                                 743             807           1,390           1,420
  Grant and government sponsored
   research revenues                                437               9             605               9
                                           ------------    ------------    ------------    ------------
     Total revenues                              21,384          11,285          40,950          18,546
                                           ------------    ------------    ------------    ------------
Operating costs and expenses:
  Cost of product sales                          11,743           6,113          22,017           9,131
  Collaboration profit sharing                    3,602             607           7,208           1,032
  Research and development                        4,538           3,864           9,044           7,494
  Selling, general and administrative             5,036           4,434           9,591           7,501
  Expense for patent related matter                   -               -               -           1,264
                                           ------------    ------------    ------------    ------------
     Total costs and operating
      expenses                                   24,919          15,018          47,860          26,422
                                           ------------    ------------    ------------    ------------
Loss from operations                             (3,535)         (3,733)         (6,910)         (7,876)
Other income (expenses), net                       (100)             22            (183)             18
                                           ------------    ------------    ------------    ------------
Net loss                                   $     (3,635)   $     (3,711)   $     (7,093)   $     (7,858)
                                           ============    ============    ============    ============
Basic and diluted net loss per share       $      (0.09)   $      (0.09)   $      (0.17)   $      (0.20)
                                           ============    ============    ============    ============
Shares used in computing basic and
 diluted net loss per share                      42,465          41,713          42,355          40,211
                                           ============    ============    ============    ============


                                     -more-



                                        7

                                     CEPHEID
                      CONDENSED CONSOLIDATED BALANCE SHEETS
                                 (in thousands)



                                                            June 30,      December 31,
                                                              2005            2004
                                                          ------------    ------------
                                                           (unaudited)         (1)
                                                                    
                         ASSETS
Current assets:
  Cash and cash equivalents                               $     18,448    $     23,189
  Marketable securities                                         34,000          34,250
  Accounts receivable                                           12,570          14,584
  Inventory                                                      8,298           6,544
  Prepaid expenses and other current assets                      1,314             402
                                                          ------------    ------------
Total current assets                                            74,630          78,969
Property and equipment, net                                     12,042           9,756
Restricted cash                                                    688             688
Intangible assets, net                                          29,708          30,902
                                                          ------------    ------------
Total assets                                              $    117,068    $    120,315
                                                          ============    ============

          LIABILITIES AND SHAREHOLDERS' EQUITY
Current liabilities:
  Accounts payable                                        $     12,930    $      8,074
  Accrued compensation                                           2,594           2,836
  Accrued royalties                                              2,414           2,113
  Accrued other liabilities                                      4,103           4,517
  Current portion of deferred revenue                            2,853           3,847
  Current portion of license fee payable                        10,683          10,476
  Current portion of equipment financing                         2,061           1,889
                                                          ------------    ------------
Total current liabilities                                       37,638          33,752

Long term portion of deferred revenue                            5,238           6,190
Long term portion of licensing fees payable                      6,700           8,561
Equipment financing, less current portion                        2,358           1,604
Line of credit                                                   4,000           4,000
Deferred rent                                                      654             599
Commitments
Shareholders' equity:
  Preferred stock                                                    -               -
  Common stock                                                 153,935         152,136
  Additional paid-in capital                                     7,519           7,517
  Accumulated other comprehensive loss                              26            (137)
  Accumulated deficit                                         (101,000)        (93,907)
                                                          ------------    ------------
Total shareholders' equity                                      60,480          65,609
                                                          ------------    ------------
Total liabilities and shareholders' equity                $    117,068    $    120,315
                                                          ============    ============


(1) The balance sheet at December 31, 2004 has been derived from the Company's
audited financial Statements, which are included in the Company's 2004 Annual
Report on Form 10-K filed with the Securities and Exchange Commission.

                             See accompanying notes.