Early diagnosis of viraemia in some experimental arbovirus infections in mice.

: Viraemia was demonstrated by the indirect haemagglutination (IHA) test in newborn white mice infected with dengue type 1 and 2 and Japanese encephalitis viruses but not with Chikungunya virus. The IHA allowed the detection of viraemia in the flavivirus infections before the appearance of clinical symptoms of the disease and was strictly specific.