Volume 47, Issue 2
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



We investigated the process of sporozoite transmission during blood feeding for and experimentally infected with . When infective mosquitoes were fed 22–25 days postinfection on an anesthetized rat, sporozoites were detected in the midgut of 96.5% of 57 (geometric mean [GM] = 32.5, range 3–374) and in 96.2% of 26 (GM = 19.5, range 1–345). There were no significant differences between species either in salivary gland sporozoite loads or in the number of ingested sporozoites. There was a significant linear relationship between sporozoite loads and the numbers of ingested sporozoites for both (r = 0.38) and (r = 0.69). Subsequently, were tested for sporozoite transmission by allowing them to feed individually on a suspended capillary tube containing 10 µl of blood. A total of 83.3% of 18 infective mosquitoes transmitted a GM of 5.9 (range 1–36) sporozoites. The same mosquitoes contained a GM of 23.4 (range 2–165) ingested sporozoites. The number of ingested sporozoites was related to sporozoite loads (r = 0.42) but not to the number of sporozoites ejected into capillary tubes. Ingested sporozoites remained in the midgut up to 10 hr after feeding. The comparable numbers of sporozoites ingested by infective mosquitoes in both experiments indicates that the actual number of sporozoites transmitted to the vertebrate host during blood feeding is significantly reduced by the blood ingestion process. The detection of ingested sporozoites by simple methods that avoid contamination by mature oocyst or hemolymph sporozoites may facilitate determinations of the minimal numbers of sporozoites released during blood feeding either by naturally or experimentally infected mosquitoes.


Article metrics loading...

The graphs shown below represent data from March 2017
Loading full text...

Full text loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error