Historical reference on JE in Russia
Despite the wide spread of Japanese encephalitis in the Pacific countries since the beginning of the 20th century, this disease became known in Russia only since 1938. Outbreak of the disease was observed in the regions of Primorye (Far East) in late August 1938.
Further outbreaks were observed in 1939, 1940, 1943 and 1958.
Natural foci of disease are divided into three types:
Constant (1 area of Primorye);
unstable (4 regions of Primorye);
foci of sporadic morbidity (5 districts of Primorye).
Russia borders on countries with the highest incidence of Japanese encephalitis: Japan, Korea, China.
The earliest disease was noted in Russia on August 21. More often, the first diseases appeared at the end of August or even in September. The incidence rates in different countries do not coincide, but in all countries they refer to the second half of the warm year.
The fact of global warming can at any time change the picture of morbidity in Russia in the direction of increase.
The most unsuccessful years (1938,1939,1943) coincided with an abundance of rains and high temperatures. But in the literature it is noted that weather conditions do not always directly affect the epidemic season. We need to keep in mind other, sometimes unclear, factors for us. So well-being in the last decades can negatively affect the readiness for the outbreak of Japanese encephalitis.
In 1940 Russian scientists A. Smorodintsev and A. Drobyshevsky created a vaccine against Japanese encephalitis from the emulsion of the brain of white mice infected with lethal doses of the virus, and then inactivated by formalin. Later the vaccine was repeatedly modernized. In 1988 the registration of the vaccine was suspended.
In the 1990s, the vaccine of the Pasteur Merieux production was periodically used to vaccinate the personnel of the Navy of the Pacific Fleet.