Susceptibility of Anopheles omorii to Plasmodium yoelii nigeriensis

和世, 一盛; 毅, 栗原; 良, 荒川; 清, 上村; 正聡, 中村

doi:10.7601/mez.40.341

Cited by 2 publications

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“…gambiae (Graves and Curtis 1982). Ichimori et al (1989) reported that the susceptibility level of An. omorii from Japan was higher than those of An.…”

Section: Discussionmentioning

confidence: 98%

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Susceptibility of the Mosquitoes Anopheles minimus, An. sinensis, and An. saperoi (Diptera: Culicidae) from the Ryukyu Archipelago, Japan, to the Rodent Malaria Plasmodium yoelii nigeriense

Toma¹,

Miyagi²,

Tamashiro³

et al. 2002

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The susceptibility of three anopheline mosquitoes, Anopheles minimus Theobald, An. sinensis Wiedemann, and An. saperoi Bohart & Ingram, from the Ryukyu Archipelago to the rodent malaria, Plasmodium yoelii nigeriense was examined to find new vectors other than An. stephensi Liston for rodent malaria studies in the laboratory. The survival rate of the mosquitoes after feeding on mice infected with P. y. nigeriense was also examined. The Beech strain of An. stephensi from India was compared with An. minimus from Ishigaki Island, and An. sinensis and An. saperoi from Okinawa Island. Oocysts were first found on day 3 after feeding on mice infected with P. y. nigeriense in An. stephensi, on day 4 in An. minimus and An. saperoi, and day 6 in An. sinensis. From 8 to 14 d after feeding on malaria-positive mice, oocysts were present in 97.2-100% of An. stephensi, 85.7-100% of An. saperoi, 20-74.1% of An. minimus, and 12.5-13.3% of An. sinensis. The duration of oocyst occurrence in An. saperoi was 55 d, the longest among the anopheline mosquitoes used in this study. On day 8 after feeding, sporozoites were found in the salivary glands and heads of all the mosquitoes tested. From the 10th to 16th d, sporozoites were present in the salivary glands of 14.9% (range, 9.1-28.0%) of An. minimus, 47.3% (40.7-58.1) of An. saperoi, and 96.2% (94.1-97.2) of An. stephensi, but were absent in An. sinensis. Anopheles saperoi could be an excellent vector of P. y. nigeriense because it has comparatively high susceptibility and high longevity even after feeding on infected mice.

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“…gambiae (Graves and Curtis 1982). Ichimori et al (1989) reported that the susceptibility level of An. omorii from Japan was higher than those of An.…”

Section: Discussionmentioning

confidence: 98%

“…stephensi was comparatively short. Ichimori (1989) examined the susceptibility of An. stephensi (BEECH and DELHI from India, LASS from Pakistan, IRAQ from Iraq), An.…”

Section: Discussionmentioning

confidence: 99%

Susceptibility of the Mosquitoes Anopheles minimus, An. sinensis, and An. saperoi (Diptera: Culicidae) from the Ryukyu Archipelago, Japan, to the Rodent Malaria Plasmodium yoelii nigeriense

Toma¹,

Miyagi²,

Tamashiro³

et al. 2002

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Sporogonic Development of Plasmodium yoelii in Five Anopheline Species

Vaughan¹,

Hensley²,

Beier³

1994

The Journal of Parasitology

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Sporogonic development of Plasmodium yoelii yoelii 17XNL was examined in 5 species of Anopheles mosquitoes; A. albimanus, A. dirus, A. freeborni, A. gambiae, and A. stephensi. The kinetics of ookinete formation differed among species. In A. freeborni, A. gambiae, and A. stephensi, mature ookinetes formed synchronously at 8 hr, then quickly subsided. In A. albimanus and A. dirus, ookinete formation was more protracted, and ookinete densities peaked from 12 to 24 hr. Losses in parasite abundance during the conversion of ookinetes to oocysts were similar between A. dirus and A. gambiae (55- and 41-fold losses, respectively) but were an order of magnitude less in A. stephensi (1.3-fold loss). Ookinete conversion to oocysts in A. albimanus was nil. Melanotic encapsulation of oocysts occurred in 25-30% of infected A. gambiae and A. dirus. Melanized parasites in A. gambiae at days 7-10 were small (10 microns diameter) and retort-shaped, whereas melanized parasites in A. dirus were generally as large as normal oocysts (60 microns) and many were incompletely melanized. Melanotic encapsulation did not occur in A. stephensi, A. freeborni, or A. albimanus. On day 16, sporozoites were present in the salivary glands of A. freeborni, A. gambiae, and A. stephensi, but only half of mosquitoes were mature oocysts also had gland infections. When present in the glands, sporozoites were successfully transmitted to mice via mosquito bite. Parasite populations were not normally distributed in any mosquito species but were adequately described by a negative binomial type of distribution.

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Susceptibility of Anopheles omorii to Plasmodium yoelii nigeriensis

Cited by 2 publications

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Susceptibility of the Mosquitoes <I>Anopheles minimus, An. sinensis,</I> and <I>An. saperoi</I> (Diptera: Culicidae) from the Ryukyu Archipelago, Japan, to the Rodent Malaria <I>Plasmodium yoelii nigeriense</I>

Susceptibility of the Mosquitoes <I>Anopheles minimus, An. sinensis,</I> and <I>An. saperoi</I> (Diptera: Culicidae) from the Ryukyu Archipelago, Japan, to the Rodent Malaria <I>Plasmodium yoelii nigeriense</I>

Sporogonic Development of Plasmodium yoelii in Five Anopheline Species

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