The source of avian paramyxoviruses isolated during an outbreak of influenza among children.

In 1986 five avian paramyxovirus (PMV) strains were isolated in embryonated chicken eggs from sick children with influenza. The strains were identified as PMV-2 serotype due to the close antigenic relationships between their HN-proteins and of the reference PMV-2 strains isolated from different birds all over the world. No seroconversion to the isolates was found in the sick children, however, HI-antibodies were detected in hen's sera, eggs of which were used for the new strains isolation.

Analysis of influenza A virus neuraminidase using lectin test and monoclonal antibodies.

Influenza viruses causing epidemics in the U.S.S.

Population variability of serotype 3 adenoviruses circulating in the U.S.S.R.

Composition analysis of natural populations of adenovirus serotype 3 (Ad 3) strains--based on samples selected out of 170 strains isolated in different regions of the U.S.S.

Influenza activity in Czechoslovakia and the USSR, 1980-1985.

Between 1980 and 1985, Czechoslovakia had experienced 4 and the USSR 3 major influenza outbreaks. Of the 3 epidemic outbreaks in the USSR, 2 were associated with influenza B virus (in the 1980/81 and 1983/84 seasons) and 1 with influenza A virus of the H3N2 subtype. In the USSR, influenza A (H1N1) virus never predominated as a cause of epidemic during the 5 years period.

Return of epidemic A1 (H1N1) influenza virus.

Limited outbreaks of influenza were reported in the far east of the U.S.S.

Intestinal influenza: replication and characterization of influenza viruses in ducks.

Influenza A viruses isolated from the cloaca of naturally infected feral ducks replicate in the lungs and in the cells lining the intestinal tract of feral and domestic ducks. Despite the low pH of the gizzard, the duck influenza viruses reach the intestines via the digestive tract and are found in high concentration in the feces. The viruses retain infectivity in fecal material for at least 30 days at 4° and for 7 days at 20°.

Comparison of influenza viruses isolated from man and from whales.

Four isolates of influenza virus strains from Moscow and Habarovsk that caused outbreaks of influenza in November and December 1977 in several cities of the USSR were studied and their haemagglutinins and neuraminidases were compared with those of other human and animal influenza viruses including A/whale/Pacific Ocean/76. In H1 tests these isolates, designated A/USSR/77, reacted with immune serum against A/FM/1/47 (H1N1) to the homologous titre, and with antiserum against A/whale/PO/19/76 virus to 1/8 of the homologous titre. In neuraminidase inhibition tests all A/USSR/77 isolates showed the presence of human N1 type neuraminidase, more closely related to A/sw/New Jersey/76 (Hsw1N1) than to A/FM/1/47 (H1N1) virus.

Influenza in the USSR in 1977: recurrence of influenzavirus A subtype H1N1.

Early in November 1977, several outbreaks of influenza were reported in the far eastern region of the USSR. The epidemic spread rapidly throughout the country affecting mainly people under the age of 20 years. Most of the strains of virus isolated were found to be influenza A subtype H1N1.

Persistent SV5 virus infection in continuous cell cultures.

A continuous line of guinea pig kidney cells (CGPK/H) and a continuous line of mouse fibroblasts (L/H) spontaneously infected with parainfluenza virus SV5 were found. These cultures showed no enhanced cell degeneration or symplast formation, nor was haemagglutinin accumulation or infectious virus demonstrated in them. However, regular reproduction of ribonucleoprotein (RNP) characteristic of parainfluenza viruses, morphologically complete virions and antigens producing antibody to SV5 virus were found in the cells.