| arthropod-borne viral infections of man in nigeria, 1964-1970. | during the years 1964 to 1970, 171 arboviruses of 15 different types were isolated from humans in nigeria. isolation rates were highest in 1969, and lowest in 1965 and 1967. monthly arbovirus activity was highest in the rainy season months of june, july and august and lowest in the dry months of january and february. viruses were isolated from all age groups, with the majority from children one to four years old. the viruses isolated in largest numbers were chikungunya and yellow fever, which ca ... | 1975 | 1124969 |