• Citations Per Year
Learn More
Prototype strains of the influenza A (H3N2) virus can be arranged on a gradient showing the degree of the antigenic drift which the haemagglutinins of the strains have undergone. The demonstration of fine antigenic differences is based on an antiserum absorption test which allows a detailed antigenic analysis of strains. The gradient provides information on(More)
Eggs deposited by different migrating wild bird species in pond farm areas in Hungary were examined for yolk antibodies to different variants of human A/H3N2 influenza virus. Antibodies to Victoria/75 and Texas/77 occurred in 17.9 and 32.0% of gull eggs, and 5.6 and 16.4% of common tern eggs, respectively, while antibodies to A/H1N1/77 occurred in roughly(More)
In Hungary the 1971 influenza epidemic, unlike earlier influenza A2 epidemics, started unusually early and in 2 foci. Average morbidity (19.3%) was in the usual range but the geographical distribution of the cases was irregular. When 179 isolates were analysed antigenically with monospecific sera prepared by serum adsorption, it was found that they(More)
A micro-method based on Warren's colour reaction has been developed for influenza neuraminidase and neuraminidase-inhibition assays. Extraction with butanol is omitted and the assay is performed in wells of special plexiglass trays, where the reaction mixon and compared to controls in the same tray. The micro-assay, being inexpensive, time-saving and easy(More)