Entomopathogenic bacteria isolated from
Simulium
larvae and adults from breeding sites in the states of São Paulo and Rio de Janeiro, Brazil, were identified as 18 strains of
Bacillus thuringiensis
and one of
B. sphaericus. Most of these strains were serotyped according to their flagellar antigens. However, nine of the
B. thuringiensis samples, could not be serotyped and were designated as "autoagglutinating"; they were also shown to be toxic in preliminary tests against
Aedes aegypti
larvae. Additionally, B.
sphaericus
was also shown to be toxic towards
Culex quinquefasciatus
larvae.
