The present study was conducted on eight schools representing four different districts in Cairo Governorate from December 2006 till November 2007. The total annual number of school dust mites collected was relatively low (66 individuals). Shobera Al-khama schools embraced the highest population mite density (65.15%) followed by Al-Abassia (16.16%), Al-Salam city (9.09%) and Nasr city recorded the lowest population density (7.58%). The most abundant family collected was Pyroglyphidae representing 27.27% of the total number distributed between two different species of the Genus Dermatophagoides (D.pteronyssinus and D. farinae). This followed by families Cheyletidae and Dermanyssidae, each comprises 25.75% of the total with a single species for each; Cheyletus malccensis and Dermanyssus sp., respectively. Family Acaridae was represented by (21.21% of the total) and came later in abundance. The average number /5 gm. dust ranged between only one individual during April and July and 20 individuals during November, however completely absent during March and September. dermanyssids and acarids were present in seven months, cheyletids in six months and pyroglyphids in five months. All mite species were recorded with relatively higher rate during cold months reaching its maximum in January for Pyroglyphidae and Acaridae and during October and November for Cheyletidae and Dermanyssidae. The lower rate of these mites obtained during hot months. These results indicate that the lower the temperature, the higher population density of school dust mites.

We report the case of a 31-year-old male patient, presenting to the emergency department (ED) with a 6-week history of left-sided lateral neck pain, along with a minor localized swelling. A few weeks after the beginning of his complaints, he contracted a mild coronavirus disease 2019 (COVID-19). Upon examination, his aches were defined as carotidynia; thus, proper radiologic evaluation was carried out. While ultrasound (US) and magnetic resonance imaging (MRI) scans showed evident signs of left common carotid (LCC) vasculitis, computed tomography angiography (CTA) and positron emission tomography-CT (PET-CT) scans revealed no vascular findings. Unexpected hypermetabolic hilar and mediastinal lymphadenopathy was found on PET-CT, necessitating lymph node biopsy. Pathology results displayed noncaseating granulomas. Besides, angiotensin-converting enzyme (ACE) levels in blood were high. Sarcoidosis, with concurrent LCC vasculitis, was diagnosed, and corticosteroid therapy was started. Shortly thereafter, remarkable recovery ensued.

The present research was carried out to study ecto-parasites infesting rats at Mostorod and Bahteem districts, Qaliubiya Governorate, during 2008 from may till October. Three rat species parasitized by ectoparasites, R. Rattus rattus having the highest number of parasites (54.5%). This was followed by R. norvegicus (29.5%), and Mus musculus (16.0%) Although Mus musculus did not show a high infestation rate compared to Rattus rattus or R. norvegicus, it harbored seven species of parasites. Rattus rattus and R norvegicus had six species of ectoparasites recovered. The identified ectoparasites isolated from skin and hair of rats based on their morphological characteristics were: Polyplax spinulosa (43.6%),Laelaps nuttali (23.5%), Polyplax serrata (11.3), Ornithonyssius bacoti (10.3%), Dermanyssus sanguineus (7.3%),Dermanyssus americanus (2.8)and Rhipicephalus sanguineus. (1.3).The infestation rate of the parasite varied based on the rat species, R. rattus having the highest infestation rate. Polyplax spinulosa parasitized predominantly R. rattus, while Laelaps nuttali and Ornithonyssius bacoti ware found mainly on R. norvegicus. Dermanyssus sanguineus was predominantly R. rattus, and Mus musculus, while Dermanyssus americanus was found mainly on R. rattus. Polyplax serrata was found on R. rattus R. norvegicus, and Mus musculus while Rhipicephalus sanguineus was only recovered on Mus musculus. Ectoparasite infestation was also influenced by the sex of the host, with male rats (73.7%) manifesting a significantly higher (p<0.05) infestation rate than female rats (26.3%). All recovered ectoparasites were common parasites of rats. Infested rats near human habitations in the area warrant possible rodent-borne diseases among the residents thus, an investigation of the occurrence of rodent-borne diseases among the dwellers may provide epidemiologic pattern related to such diseases including vectors of zoonotic diseases.