Bionomics of ticks collected from Sinai peninsula: 2-abundance, attachment sites, and density estimators of ticks infesting arabian camels

In this study, ten camels were examined monthly. A total of 5468 adult ticks of six species and subspecies of genus Hyalomma; H. dromedarii, H. Impeltatum, H. A excavatum, H. A. anatolicum, H. schulzei and H. marginatum rufipes in addition to 115 Hyalomma nymphs species were collected. Of these, the first four types represented about 96.2% of the total collection. The infestation rate was higher during the period from March to November. The large number of the adult ticks was concentrated on tail, brisket, anus and udder which totaled 68.2%. Attachment sites of males and females were not significantly correlated in most species. Nymphs were localized in few sites; whereas 91.6% of the total nymphs were attached to hump, neck, head [ear] and side. H. Dromedarii, H. Impeltatum and H a. excavatum were found on most of the body sites, tail, brisket, udder and anus totaling 79.9%. Males exceeded females in all sites and were on neck and legs. Females were the only stage collected from udder. Both sex of H. a. anatolicum were collected from tail. H. Schulzei and H. m rufipes were concentrated in brisket, udder, anus and tail

Haemoglobinometry as a method to determine the blood meal size of two argasid tick specties

A standardized clinical method for measuring hemoglobin was applied to measure the quantity of blood ingested by Argas persicus and A. hermanni feeding on chicken and pigeons, respectively. The blood fed ticks were added to a reagent that converted all hemoglobin to hemoglobincyanide [HiCN], which can be read spectrophotometrically. The validity of this method was established by comparing hemoglobin determination with the size of blood meals measured by weight. Linear relationships with high correlation coefficients were obtained for nymphs, males and females of A. persicus and A. hermanni, showing that both gravimetric [weighing] and HiCN methods gave similar estimates of ingested blood

ultrastructure of the foregut and its influence on bancroftian microfilariae ingestion in three Egyptian mosquito species

Laboratory observation on the uptake of bancroftian microfilaria [mf.] by 3 Egyptian mosquito species revealed that microfilaria ingested by some tested species were badly damaged during ingestion. The foregut structures in Culex pipiens, Aedes caspius and Anopheles multicolor were investigated by light and scanning microscope techniques. In Ae. caspius, which has well developed pharyngeal armatures, and An. multicolor, which has well developed cibarial armature, high proportion of microfilaria was scored and damaged. Vice versa, Cx. pipiens, considered as the main vector of bancroftian filariasis, had neither developed pharyngeal nor cibarial pumps, the percentage of damaged mf was very small. The relationship between the injury of mf in mosquito midgut and the presence of the foregut armatures was discussed

role of rodents as reservoirs for some diseases in new reclaimed areas in north Sinai

In a trial to determine the role of Sinai rodents as reservoirs to rickettsial diseases, the IFA technique was used to detect the presence of R. typhi and spotted fever group in blood of some commensal and wild rodent species collected in Sinai during the last five years [1985-1989]. Out of 277 Rattus spp. collected in El Arish [47.3%] were positive to R. typhi and only [5.9%] of 35 Mus musculus were positive to R. typhi As for GerbiIlus spp. only [1.5%] of 206 animals were positive for R. typhi. The positive cases of spotted fever group were [34.6%] in Rattus spp. and [18.8%] in Gerbillus spp. With the presence of ticks and fleas in Sinai, the potentiality for rickettsial disease transmission exists. Such disease impose serious impacts on manpower in Sinai especially with the ambicious development plans ongoing presently

review and distribution map of rodents in Sinai, Egypt

Sinai is living reconstruction and development in all fields. On the other hand, rodents have a time honoured public health place in the history of science and followed man wherever he goes. Hence, a review and distribution map of rodents of medical and veterinary importance were given

seasonal abundance and the maturity of some rodent species in Ismailia Governorate, Egypt

The abundant rodent species in Ismailia Governorate were R.r.frugivorous [70%], R. norvegicus [24.8%], R.r. alexandrinus [2.7%], Nesokia indica [1.9%] and N. musculus [0.6%]. The highest indices were 0.14, 0.464, 0.03, 0.027 and 0.008 respectively during September, December, October [1983], February and June [1984]. Rodent densities in the five sampled areas were 25.8% in Ismamix Factory, 22.5% in Serabium Village, 20% in Forage Factory, 16.7% in Macaroni Factory and 15% in Abo-Atwa Village. The highest density of pregnancy rate of R. norvegicus was 100% during November and the lowest was 25% during October. For R.r. frugivorous the highest was 50% during November and the lowest was 25% during both September and December. The, mean number of embryos for R. norvegicus and R.r. frugivorous were 8.7 and 7.9 respectively. The average maximum number were 11 and 9.5 respectively

Juvenile hormone analogues: effect on eggs of aedes caspius pallas [Diptera: culicidae]

Eight chemicals of the arylterpenoid group were evaluated for juvenile hormone activity against Aedes caspius egg [less than 12-hr old]. Four compounds out of them were effective. At 1 ppm and 0.1 ppm treated eggs with compound VI and compound I showed reduction in the per cent of pupation respectively. At 0.1 ppm compound VI showed reduction in per cent of hatching and pupation with elimination of the males from population, while with compound VII at 0.1 ppm a delayed toxic effect on the larval stage was observed