Belém VIRUS Laboratory

fter t.
Appendix III
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mosquito iso1ates were 14 from Haema~o~us spp., 1 from Sabethini, and 1 from
a mixed pool of Aedes and Sabethini.
Four of the mosquito strains carne from
the Oriboca epidemic area, the others from Lazaropolis do Prata (Para State) ,
Macapa (Amapa Territory) and the Utinga forest near Belem.
a gap of 5 years, a further iso1ate was made in 1960 from the
blood of a sentinel monkey stationed 94 km. from Belem along the Belem-
Brasilia highway trace43 In the same year 3 strains of 17D vaccine virus
were iso1ated at the BVL from recent1y inocu1ated persons, and in 1962 there
were 2 further iso1ations from poo1s of Haemagogus spp. caught at km. 87 and
9
94 respective1y, of the Be1em-Brasi1ia road. ln December 1964 a strain was
isolated from the blood of a sentinel monkey in Utinga forest, Belem, more
than 9 years since the last isolation there (from Haema~o~us), and in view
of the continuous surveillance of the are a during that time, yellow fever
seems to have been actually absent, probably brought back by the movements
of monkeys44 Eradication of jungle yellow fever from Amazonia is impossible,
but continued~. aegypti control has taken care of any possibility of urban
epidemics, and vaccination is carried out when indicated in rural locations
Louis encephalitis
This is another virus which causes epidemics in the USA but has not
been isolated from mau in Amazonia. Isolations from Sabethes belizarioi
(BeAr 23379) and from Gi~anto1ae1aps mites combed from an Oryzomys rat have
been made in the region45. There have a1so been iso1ations from a poo1 of
Culex (Culex) mosquitoes (probably ~
) dec1arator) and 3 forest birds
9
and from a Didelphis marsupial and a sentinel mouse group . As with EEE,
up to 17% of forest birds were found to have HI antibody confirmable by
N test, but not rodents or marsupiaIs.
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