Entity

Time filter

Source Type


Soliman M.I.,Research Institute of Medical Entomology
Journal of the Egyptian Society of Parasitology | Year: 2010

Susceptibility level to difethialone 0.0025% anticoagulant rodenticide by bioassay method were studied (during 2009 & 2010) to the Norway rat Rattus norvegicus and the roof rat Rattus rattus trapped from Giza and Menoufia Governorates (G) where anticoagulant rodenticides were used to control rodents for long periods. Complete mortality was obtained for both species at two Governorates within 3 days no-choice feeding test period, indicated to be susceptible to difethialone. The bait consumption and corresponding active ingredient intake was more in R. rattus than R. norvegicus. The mean intake values for R. rattus were 3.1 & 2.29 mg/kg at Giza G and 2.63 & 2.65 mg/kg at Menoufia G for males and females and for R. norvegicus 1.93 & 2.29 mg/kg at Giza and 2.14 & 2.09 mg/kg at Menoufia for males and females, respectively. Within 2 days no-choice feeding test period, difethialone caused mortality ranged between 70-80% for both species. The higher intake values of active ingredient for died animals was recorded for R. rattus males at Giza G (2.23 mg/kg), while the lower value was recorded for R. norvegicus females of at Menoufia G (1.37 mg/kg). Within one-day no-choice feeding test period, difethialone caused mortality ranged between 60-70% for R. norvegicus and 50-60% to R. rattus. The higher intake values for died animals were recorded for R. rattus males at Giza G (1.45 mg/kg), while the lower value was recorded for R. norvegicus males at Giza (0.75 mg/kg). Source


Mikhail M.W.,Research Institute of Medical Entomology
Journal of the Egyptian Society of Parasitology | Year: 2010

Susceptibility levels of the Norway rat, Rattus norvegicus and the roof rat, Rattus rattus to bromadiolone anticoagulant rodenticide by bioassay and biochemical methods were studied. Animals were trapped from Giza and Qualyobia Governorates in which the anticoagulant rodenticides were used to control rodents for long periods. Complete mortality was obtained for both species and sexes within standard no-choice feeding test period (4 days) indicating bromadiolone susceptibility. Treatment of rats with LD50 showed high prothrombin times which also indicate the susceptibility of the tested animals. In treated rats, bromadiolone caused significant decrease in the total erythrocytic counts and increase in the total leucocytic counts. In survivors, RBCs, WBCs approximately reached the control levels at day 43 post treatment. Also, treatment decreased neutrophils, eosinophils, basophils and monocytes but increased the lymphocytes in dead and survived animals more than in controls. Source


Soliman M.I.,Research Institute of Medical Entomology
Journal of the Egyptian Society of Parasitology | Year: 2011

A preliminary survey of domestic rodent and the efficacy of bendiocarb, diazinon and pirimiphos-methyl insecticides to their fleas were carried out in Dakahlia Governorates (Aga, Meet-Ghamr, El-Senbellawen, Temi El-Amded, Beni-Abed, Dekernes, Nabarow, Talkha, Menia El-Nasr and El-Kordy). Rodent index (number of rodent/trap) and percentage frequency of drodent species were recorded from October 2010 to May 2011. The main rodent species found were the Norway rat, Rattus norvegicus, the grey-bellied rat, R. rattus alexandrinus, the white-bellied rat, R. r. frugivorus and the house mouse, Mus musculus. The rodent index at Beni-Abed, Nabarow, Meet-Ghamr, Dekernes and El-Kordy centers showed 0.46, 0.39, 0.34, 0.33 & 0.33, respectively, while Menia El-Nasr center showed the lowest (0.08). Aga, Talkha, El-Senbellawen, and Temi El-Amded centers showed moderate (0.25, 0.21, 0.2 & 0.16, respectively). The commonest flea species was the oriental rat flea, Xenopsylla cheopis, the mouse flea, Leptopsylla segnis, the dog flea, Ctenocephalides canis and the sticktight flea Echidnophaga gallinacea. The highest number of fleas was on R. norvegicus (Flea index=10.9) while lowest number was on Mus musculus (Flea index=0.1). X. cheopis was the highest frequency distributed for all domestic rodent species (60.9%), while, C. canis was the lowest (1.6%). The results showed that bendiocarb was effective (Lc50=0.389%) than diazinon (Lc50=1.039%) and pirimiphosmethyl (Lc50=2.056 %). Source


Abdel-Hamid Y.M.,Research Institute of Medical Entomology
Journal of the Egyptian Society of Parasitology | Year: 2010

The studies on hematologic changes in humans or animals as a result of bedbug bites are lacking. This study was undertaken to examine changes in the blood picture of mice (Mus musculus) exposed to Cimex lectularius biting. As compared to the check animals, mice exposed to bedbug bites either once or twice within 7 days showed insignificantly higher WBC's (1.6 and 2.8% increase, respectively) and lower HGB content (0.5 and 0.8% decrease, respectively) and significantly higher PLT's (P < 0.01) by 2.2% and 3.0%, respectively. Significantly higher (P < 0.01) RBC's counts in mice bitten once than those of normal animals or those exposed to twice bites (5.3 and 5.9% increase, respectively). Bedbug biting exerts its effects largely upon the differential WBC's. Mice bitten once or twice showed significantly lower number of neutrophils (1.2% & 12.1% decrease, respectively) than those for normal animals. Mice exposed to twice bites showed significantly (P < 0.01) higher numbers of lymphocyte (18.8%), monocyte (13.6%), eosinophil (200.0%) and basophil (500%) than those of normal mice. Source


Abdel-Hamid Y.M.,Research Institute of Medical Entomology
Journal of Vector Borne Diseases | Year: 2012

Background & objectives: In Egypt, Phlebotomus papatasi is the main vector of cutaneous leishmaniasis. In nature, P. papatasi feeds on blood from different hosts and sucrose (other sugars) mainly from fig fruits. The aim of this study was to examine the effects of three food regimes on the life table parameters of females mainly the life expectancy as a factor determining the fly's capability for Leishmania transmission. Methods: Females maintained on different diets (30% sucrose solution, Guinea pig blood and sucrose followed by blood) under laboratory conditions were observed for offspring emergence to examine the survival period expressed as the median emergence time (E50) and female fecundity (females/female). Life table was constructed including the mean life expectancy at emergence (e0) as a measure of longevity and the mortality rate per day (qx). Results: Females fed on sucrose-blood has the highest fecundity and the shortest E50 compared to those fed on other diets. The mean life expectancy at emergence (e0) differed significantly with the highest value being for females fed on sucrose. Interpretation & conclusion: The calculated expectancies for female life beyond the infective age (8 days) indicated that more flies would survive to become infective when fed on sucrose-blood meals than those offered blood alone which increases its capability for Leishmania transmission. Source

Discover hidden collaborations