Biology Reference
In-Depth Information
Figure 1.4, cont'd
to the unstable transmission class. This re-assignment is shown in the final
limits presented in
Fig. 1.3
A1-D2.
Relapse of
Plasmodium vivax
blood infections.
The prevalence surveys
used detect parasites in the blood and not latent infections in the liver. Pri-
mary blood infections detected by these surveys are indistinguishable from
relapses caused by previously dormant parasites from the liver. The estimates
produced by the model were, therefore, the combined prevalence of pri-
mary infections and relapses.
The impact of low parasitaemia levels
.
Plasmodium vivax
parasites are typ-
ically found in the blood at much lower densities than are found for
P. falciparum
and so are less likely to be detected by some diagnostic meth-
ods. We made no direct adjustments for these 'sub-patent' infections. It
is important to note that
P. vivax
can cause fever and anaemia at lower
