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View article: The international reference preparation of influenza virus haemagglutinin (type A).
The international reference preparation of influenza virus haemagglutinin (type A). Open
This paper describes the international collaborative assay that led to the establishment in 1967 of the International Reference Preparation of Influenza Virus Haemagglutinin (Type A) and the studies completed during the following years on …
View article: EVALUATION OF RESULTS OF THE TESTING OF SMALLPOX VACCINES. A REPORT ON STATISTICAL METHODS.
EVALUATION OF RESULTS OF THE TESTING OF SMALLPOX VACCINES. A REPORT ON STATISTICAL METHODS. Open
A report is given on the statistical methods used in the evaluation of results in the international assay of smallpox vaccines, and on special statistical problems connected with the counting of lesions (pocks and plaques). Variances due t…
View article: THE INTERNATIONAL REFERENCE PREPARATION OF SMALLPOX VACCINE. AN INTERNATIONAL COLLABORATIVE ASSAY.
THE INTERNATIONAL REFERENCE PREPARATION OF SMALLPOX VACCINE. AN INTERNATIONAL COLLABORATIVE ASSAY. Open
A purified, concentrated sheep vaccine, prepared from a vaccinia strain in use in the United Kingdom for more than 60 years, has been established as the International Reference Preparation of Smallpox Vaccine, intended to permit comparativ…
View article: The International Standard for Human Syphilitic Serum.
The International Standard for Human Syphilitic Serum. Open
Following the establishment by WHO of International Reference Preparations of Cardiolipin and Egg Lecithin to facilitate reproduction of cardiolipin antigens for use in serological tests for syphilis, a series of studies has been carried o…
View article: International Standard for Antistreptolysin-O.
International Standard for Antistreptolysin-O. Open
A pool of highly potent freeze-dried sera from three patients with streptococcal infection has been examined by twelve laboratories in eleven countries and has now been established as the International Standard for Antistreptolysin-O by th…
View article: Third International Reference Preparation of cardiolipin with special reference to its use in improved serological tests for treponematoses.
Third International Reference Preparation of cardiolipin with special reference to its use in improved serological tests for treponematoses. Open
The Third International Reference Preparation of Cardiolipin was produced (in a quantity of 2400 ml) at the WHO Serological Reference Centre, Copenhagen, and assayed in 1957 against the Second International Reference Preparation by four la…
View article: Standardization of a new batch of purified tuberculin (PPD) intended for international use.
Standardization of a new batch of purified tuberculin (PPD) intended for international use. Open
A new batch of PPD tuberculin, RT 23, prepared at the request of UNICEF by the Statens Seruminstitut, Copenhagen, has been compared with previous batches of tuberculin from the Statens Seruminstitut and with the International Standard for …
View article: Investigations on the rapid plasma reagin test.
Investigations on the rapid plasma reagin test. Open
The sensitivity of a recently devised serological test for syphilis, in which plasma is substituted for the more conventional serum specimen, was compared with that of the VDRL test. The authors specify the test antigens used and describe …