Volume 45, Issue 5
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



Mature oocysts of and from western Thailand were separated from the midguts of by collagenase digestion, and the number of sporozoites contained in each was counted. For 26 oocysts, the mean count was 3, 688 (range 1, 954–5, 577) and for 14 , the mean count was 3, 385 (range 1, 359–4, 554); a single oocyst contained 7, 521. Counts were not significantly correlated with oocyst density, oocyst age, or identity of the examiner. There may have been strain differences in fecundity, particularly between lines maintained in vitro. Mosquitoes receiving a second, uninfected blood meal seven days after feeding on -infected volunteers developed no additional sporozoites per oocyst, but had salivary glands 3.4 times as infected. By calculation, more than 20% of sporozoites released from oocysts subsequently invade the salivary glands.


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