Rhinosinusal myiasis by Oestrus ovis third stage larva / Miasis rinosinusal por larva de Oestrus ovis de tercer estadio

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PREVALENCE AND INTENSITY OF THE SINUS ROUNDWORM ( SKRJABINGYLUS CHITWOODORUM) IN RABIES-NEGATIVE SKUNKS OF TEXAS, USA.

: Estimates of the distribution and prevalence of the sinus roundworm ( Skrjabingylus chitwoodorum) have been based largely on the inspection of skunk (Mephitidae) skulls showing damage from infections. We examined 595 striped skunks ( Mephitis mephitis) and nine hog-nosed skunks ( Conepatus leuconotus) that had tested negative for rabies by the Texas Department of State Health Services (US) between November 2010 and April 2015 to determine species of Skrjabingylus, prevalence and intensity of infection, and distribution of infection in Texas by county. We expected ecoregions with more precipitation to have higher rates of infection than more-arid ecoregions. Prevalence of S. chitwoodorum in striped skunks was 48.7%, with a mean intensity of 19.4 (SD=24.44, range=1-181) nematodes. There was a bias for the left sinus. The prevalence of infection varied among ecoregions of Texas, but it was not correlated with precipitation. Infection intensity did not vary among ecoregions. The prevalence of sinus roundworms in rabies-negative skunks suggested that behavioral changes because of skrjabingylosis might have been responsible for the submission by the public of some skunks for rabies testing.

EUCOLEUS BOEHMI INFECTION IN THE NASAL CONCHAE AND PARANASAL SINUSES OF RED FOX (VULPES VULPES) ON PRINCE EDWARD ISLAND, CANADA.

Eucoleus boehmi (Nematoda: Capillariidae) occurs in the nasal conchae and paranasal sinuses of wild and domestic canids. We surveyed the red fox ( Vulpes vulpes ) on Prince Edward Island, Canada, for E. boehmi infection and characterized the associated histopathology. Nasal capillarid infections were detected based on histologic examination of three coronal sections of the nasal cavity and by centrifugal flotation examination (CFE) of rectal feces. Capillarids were detected in histologic sections in 28 of 36 (78%) foxes; detection occurred most frequently in the caudal section (28 foxes) and least in the rostral section (10 foxes). Adult worm morphology was typical for capillarids (stichosome esophagus, bacillary bands, bipolar plugged eggs); E. boehmi eggs were specifically identified based on the characteristic pitted shell wall surface. Adult worms were detected in histologic sections in all 28 and E. boehmi eggs in 21 of the positive foxes. No eggs of Eucoleus aerophilus were observed in any of the sections. Affected foxes had an eosinophilic and lymphoplasmacytic rhinitis with goblet cell hyperplasia. Eggs of E. aerophilus were detected on CFE in 20 of 36 (56%) foxes; 19 of the histologically positive foxes were coinfected with E. aerophilus. Eggs of E. boehmi were detected on CFE in 26 of 36 (72%) foxes and were consistent in size and morphology with those described from wild canids, but they differed from those reported from cases of infection in dogs. Prevalence based on identification of eggs on histologic section or CFE indicated 27 of 36 (75%) red foxes examined were infected with E. boehmi.

Dissections of fresh skulls confirm low prevalence of Troglotrema acutum (Trematoda: Troglotrematidae) in German badgers (Meles meles).

We examined 131 European badgers Meles meles (Linnaeus, 1758) from 67 localities in central Germany for the presence of the cranial trematode Troglotrema acutum, as previous studies based on museum skulls might have underestimated the prevalence of the parasite in this host. We detected the flatworm in only three individuals that originated from the Rhoen Mountains (Thurigina and Bavaria). While the cranium of one host individual showed the lesions and the sponge-like widening of certain regions of the skullcap that are typical of a T. acutum infection, the skulls of the two remaining badgers did not show any deformations. The three badgers were infected by eight, 20, and 49 T. acutum individuals, respectively. Eggs of the trematode parasite were detected in the paranasal sinuses of two badgers. While badgers infected with T. acutum may not show any surface bone lesions, the results of the present study do not contradict the conclusion that the badger is only an accidental host of T. acutum.

Intranasal myiasis: a rare complication of transnasal skull base surgery.

A 57-year-old woman with a history of atypical intracranial meningioma had undergone multiple craniotomies and endoscopic skull base procedures over several years. She presented most recently with nasal discharge consisting of intranasal larvae. Isolated organisms from the nasal cavity and maxillary sinus were identified as blow fly larvae (Calliphoridae family). The patient was treated with transnasal debridement and antibiotic therapy. The organisms were successfully eradicated and she is free from further signs of infection. Intranasal myiasis is an unusual complication of anterior skull base surgery.

Surto de Oestrus ovis em ovinos em Mato Grosso / Outbreak of Oestrus ovis in sheep in Mato Grosso, Brazil

Oestrus ovis é um parasito cosmopolita que pode acometer ovinos e caprinos. A fase parasitária inicia-se após as fêmeas adultas depositarem suas larvas nas narinas dos hospedeiros. O objetivo deste trabalho foi de descrever os aspectos clínicos, epidemiológicos, macroscópicos e microscópicos de um surto de oestrose em ovinos no estado de Mato Grosso. Os principais sinais clínicos observados foram espirros e descarga nasal. Macroscopicamente havia hiperemia e edema da mucosa nasal. Os achados microscópicos eram caracterizados por hiperemia e edema moderado a acentuado e difuso, associados a infiltrado leve a moderado predominante de mastócitos e eosinófilos na submucosa. Embora a doença fosse observada em um grande número de animais a mortalidade observada nos surtos ocorreu devido à infestação por Haemonchus contortus e pneumonia.

Oestrus ovis is a cosmopolitan agent of myiasis in sheep and goats. The parasitic phase begins after adult females deposit first stage larvae into the nostrils of hosts. The aim of this study was to describe the epidemiological data, clinical signs, gross and microscopical findings of an outbreak of O. ovis myiasis in sheep in state of Mato Grosso. Sneezing and nasal discharges was the major clinical signs in infected sheep. The main gross findings include hyperemia and oedema of the nasal mucosa. At the microscopic exam there was moderate infiltration of mast cells and eosinophils in the nasal mucosa with moderate to severe oedema and hyperemia. Although affecting a large number of sheep, the mortality occurred due to other causes such as Haemonchus contortus infection and pneumonia.

[Cavicola myiasis caused by many Oestrus ovis (Linnaeus, 1761, Diptera: Oestridae) larvae in a sheep]. / Bir koyunda çok sayida Oestrus ovis (Linnaeus, 1761, Diptera: Oestridae) larvasindan kaynaklanan Kavikol myiasis olgusu.

When the head of a sheep was split into two along its longitudinal axis during a pathological examination, a large number of Oestrus ovis larvae were found in the nasal cavities, middle nasal meatus and sinuses of the sheep. A total of 114 Oestrus ovis larvae were collected, including 87 (76.32%) first stage larvae, 25 (21.93%) second stage larvae and 2 (1.75%) third stage larvae from the regions given above.

Spermiogenesis and spermatozoon ultrastructure of the cranial digenean Troglotrema acutum (Leuckart, 1842).

Ultrastructure of spermiogenesis and the main characters of the mature spermatozoon of Troglotrema acutum are described by means of transmission electron microscopy. Specimens were obtained from the nasolacrimal sinuses of an American mink (Mustela vison). Spermiogenesis in T. acutum follows the general pattern of digeneans. The zone of differentiation is a conical-shaped area bordered by cortical microtubules and delimited at its base by a ring of arched membranes. This area contains 2 centrioles associated with striated rootlets and an intercentriolar body between them. The centrioles develop 2 free flagella that grow ortogonally to the median cytoplasmic process. The posterior flagellar rotation and proximodistal fusion of the free flagella with the median cytoplasmic process originate the spermatozoon. The mature spermatozoon of T. acutum is characterized by the presence of 2 axonemes of different lengths presenting the 9+'1' trepaxonematan pattern, 2 bundles of parallel cortical microtubules, 2 mitochondria, a nucleus, and granules of glycogen. These ultrastructural characters are compared with other digenean species previously studied and the importance of different spermatological features is discussed.

Paranasal sinus bony structures and sinus functioning during viral colds in subjects with and without a history of recurrent sinusitis.

OBJECTIVES/HYPOTHESIS: The objective was to assess the impact of ostial obstruction and anatomical variations on paranasal sinus functioning during viral colds with computed tomography (CT) in subjects with and without a history of sinusitis. STUDY DESIGN: Cross-sectional study. METHODS: Twenty-three volunteers with a history of recurrent sinusitis and 25 subjects without such history who had an early (symptoms for 2-4 d) natural cold were examined by taking viral specimens and CT scans and recording symptoms. The pathological sinus changes in the CT scans were scored, and several paranasal bony anatomical variations recorded. RESULTS: Viral origin of the cold was identified in 32 (67%) subjects, similarly in the two groups. Ostiomeatal obstruction and anatomical variations were equally frequent in the subjects with and without a sinusitis history (17 of 23 vs. 17 of 25 for ostial obstruction and 17 of 23 vs. 20 of 25 for at least one variation, respectively). However, in the case of ostiomeatal obstruction the combined CT score of ethmoidal and maxillary sinuses was significantly higher in the subjects with a sinusitis history than in those without (mean +/- SD, 3.0 +/- 0.9 vs. 2.3 +/- 1.2 [P =.05, t test]). In the sinusitis-prone subjects, several variations were associated significantly with various pathological sinus CT changes (septal deviation, horizontally situated processus uncinatus, large concha bullosa, and laterally concave concha media), whereas in the control subjects, only the presence of Haller cells was related to sphenoidal sinus disease. CONCLUSION: Ostiomeatal complex obstruction and bony anatomical variations seem to have a greater impact on the functioning of paranasal sinuses during viral colds in sinusitis-prone subjects than in subjects without a sinusitis history. These differences may be associated with the increased risk of bacterial sinusitis.

Rileyella petauri gen. nov., sp. nov. (Pentastomida: Cephalobaenida) from the lungs and nasal sinus of Petaurus breviceps (Marsupialia: Petauridae) in Australia.

A new cephalobaenid pentastome, Rileyella petauri gen: nov., sp. nov. from the lungs and nasal sinus of the petaurid marsupial, Petaurus breviceps, is described. It is the smallest adult pentastome known to date, represents the first record of a mammal as the definitive host of a cephalobaenid and may represent the only pentastome known to inhabit the lungs of a mammal through all its instars, with the exception of patent females. Adult males, non-gravid females and nymphs moulting to adults occur in the lungs; gravid females occur in the nasal sinus. R. petauri is minute and possesses morphological features primarily of the Cephalobaenida but the glands in the cephalothorax and the morphology of the copulatory spicules are similar to some members of the remaining pentastomid order, the Porocephalida. This unusual combination of features distinguish the new genus from other genera in the Cephalobaenida. The occurrence of only seven fully-formed larvae in eggs in the uterus, each representing about 10% of the length of the patent female, and her presence in the nasal sinus of a dependent juvenile P. breviceps (36 gm) implies a direct life cycle.

Seasonal variations in the larval burden distribution of Oestrus ovis in sheep in the southwest of Spain.

A chronobiological study of oestrosis was conducted for larval instars of Oestrus ovis from November 2000 to September 2002 with the examination of 477 adult sheep of the southwest region of Spain. Skulls from slaughtered sheep were examined and the different O. ovis larval stages (L1, L2, L3) were recovered from the nasal-sinus cavities. O. ovis larvae were detected in 339 sheep, reaching a prevalence of 71.1%. Only one farm was free of infested sheep indicating a prevalence of the 97.91% among studied flocks. The mean larval burden was 18.54 larvae per infested head during the coldest months in the southwest of Spain when the larval burden reached its highest levels, especially of the first larval stage (L1). However, the maximum percentage of L1 coincided with the minimum percentage of the second larval stage (L2). The third larval stage (L3) was observed in relatively low levels during the entered study period, but two peaks occurred in April-May and in September-October. During the 2 years of sampling, all the different larval stages were simultaneously recovered throughout the year, indicating the existence of a long favourable period for the evolution and development of the larval instars, which would start between February and March and finishing in November.

Towards a lower prevalence of Oestrus ovis infections in sheep in a temperate climate (south west France).

Oestrus ovis larvae are obligatory parasites of the nasal and sinus cavities of sheep and goats. In the temperate climate of western Europe, fly attacks occur between May and October and the first stage larvae arrest their development within the host between October and February. Oestrosis clinical signs such as nasal discharge and sneezing are well known by sheep breeders in southwest France. According to veterinarian recommendations, most of them treat their animals with long lasting fasciolicides once a year at least, mainly during the fly activity period and at the beginning of the hypobiotic period (when the parasitic population is only constituted of larvae). The consequences of these therapeutic programs were analysed in a local slaughterhouse by larval counts. Both prevalence and intensities of O. ovis infections decreased between 1989-1991 (before the use of systematic treatments) and 1996-1998 (after the spread of these treatments). The use of systematic treatments during the fly activity period and the beginning of the hypobiotic period seems to be very efficient in O. ovis control and could theoretically lead to a possible 'eradication' program as with cattle hypodermosis. Nevertheless the presence of parasites in apparently healthy goats, the possibility for a fly generation to develop before the first treatment in July-August and the succession of several fly generations all around the year in southern Mediterranean and tropical countries will maintain O. ovis infections. Furthermore, there are increased concerns about drug residues on consumer health and environment and this is the basis for the prospect of alternative strategies in O. ovis control.

Search for the trematode Prouterina wescotti in black bears in Oregon.

Forty-six heads of free-ranging black bears (Ursus americanus) collected in May and June of 1995 and 1996 from Oregon (USA) were examined for the trematode Prouterina wescotti and other parasites. Only Sarcocystis sp. was detected in two adult male bears. Prouterina wescotti has been found only once previously in one black bear from Idaho (USA); its normal definitive host remains unknown.

Experimental infection of dogs with the nasal mite Pneumonyssoides caninum.

A successful experimental transmission of the canine nasal mite, Pneumonyssoides caninum, is described. Some 11 weeks after repeated systemic ivermectin treatment, four Beagles were inoculated via the right nostril with 20 P. caninum mites of different sexes and life stages, obtained at the necropsy of an infected dog. The inoculated dogs and a matching uninoculated control were observed for clinical signs for 14 weeks and then euthanised. Vague upper respiratory signs and a transient minor increase in the number of eosinophils in peripheral blood were recorded in the inoculated dogs. At necropsy 4-12 P. caninum mites were found in the nasal cavities and sinuses of the inoculated dogs, but none in the control. In three out of the four infected dogs mites were found in both the right and left nasal cavities and sinuses of the skull. Since in no case more mites than the number used for inoculation were detected it is not clear if the mites managed to reproduce in the dogs. Inflammatory lesions were seen most consistently in the olfactory mucosa, respiratory mucosa and tonsils, and growth of opportunistic bacteria was observed in the tonsils of the infected dogs. The inflammatory lesions seen in the olfactory mucosa may explain why dogs infected with P. caninum sometimes appear to suffer from impaired scenting ability.

Mucormicosis rinocerebral. Informe de cuatro casos / Rhinocerebral mucormycosis. Four cases report

Se informa de cuatro casos de mucormicosis rinocerebral, de su evolución clínica, antecedentes, métodos diagnósticos y tratamiento, con el objetivo de presentar al personal médico una semblanza de esta patología que orienta al establecimiento del diagnóstico temprano y tratamiento oportuno, que permitan mejorar el pronóstico para los pacientes, ya que en estudios tempranos los índices de curación alcanzan casi 50 por ciento. En aquellos que no reciben atención médica oportuna la evolución lleva invariablemente a la muerte

Ascaris lumbricoides in the paranasal sinuses of a Jamaican adult

While preparing a routine sagittal section of the human head and neck for the teaching of anatomy, 3 mature Ascaris lumbricoides worms were seen in the maxillary sinus and 3 in the sphenoidal sinus. Of the worms in the maxillary sinus, 2 were males and one was female, while in the sphenoidal sinus all 3 worms were females. The worms measured 7 - 11 cm in length Light microscope examination of the maxillary sinus wall revealed a few eggs of the parasite in close relation to the epithelium. The migratory abilities of A. Lumbricoides adult worms are well documented and most often involve the bile and pancreatic ducts (Asrat & Rogers, 1995). In a endemic area of Kashmir, India, A. Lumbricoides was the cause of acute pancreatis in 23 percent of 256 patients (Khuroo et al., 1992). Worm extraction and biliary drainage were indicated in 32 percent of 156 patients who had acute hepatobiliary and pancreatic ascariasis, and this resulted in rapid relief of symptoms in most patients (Khuroo et al., 1993). In the case represented, the ostia of the sinuses were between 3 and 4 mm in width and were therefore large enough for the passage of the worms as adults. We are not aware of any other report of ectopic ascariasis involving the sinuses. Clinical data on the current case were not available to us. A. Lumbricoides has high fecundity and the fact that only a few eggs were seen in the sinuses suggests that the worms were immature or that there was a reduction in egg production due to overcrowding or lack of adequate nutrition.(AU)

Prevalence and seasonality of Oestrus caucasicus Grunin, 1948 (Diptera: Oestridae) parasitizing the Spanish ibex, Capra pyrenaica (Mammalia: Artiodactyla).

Prevalence and intensity of parasitism by oestrid larvae in the Spanish ibex Capra pyrenaica were determined for a period of 2.5 yr in Sierra Nevada Natural Park, southern Spain. The most relevant result of this study was to find Oestrus caucasicus parasitizing this ungulate in a geographical location far from its previously known distribution, e.g., the Caucasus mountain range and central Asia. Larvae were found within 74% of the heads examined (n = 180). Prevalence was higher in females and in older animals. Lowest prevalence occurred during the summer months. The mean intensity (+/- SD) was 25.4 +/- 27.3 larvae and was similar in both host sexes. The number of larvae increased with host age and reached the highest intensities in winter, during December and January.

Prouterina wescotti n. gen., n. sp. (Trematoda: Prouterinidae N. Fam.) from the brain, lungs, and nasal sinuses of a black bear (Ursus americanus) from Idaho.

Prouterina wescotti gen. n. and sp. n. (Trematoda: Prouterinidae N. Fam.) is described from a free-ranging black bear (Ursus americanus) which died in May 1995 in northern Idaho (USA). Adult digenetic trematodes were detected in brain, lungs, and nasal sinuses, and were likely responsible for the emaciated condition, copious nasal discharge, neurological signs, and death of the bear. Mature trematodes recovered from the bear were conical with small spines on the tegument. The anterior end was broad and tapered gradually toward the posterior. Mean (+/-SE) size of the mature trematodes was 3.67 (+/-0.08) by 2.14 (+/-0.04) mm (n = 80). Eggs are operculated, gold, and 68.2 (+/-0.42) by 41.4 (+/-0.41) microns (n = 75). Suckers are well developed and located in the anterior half of the body, with the genital pore just posterior to the ventral sucker. Testes are tandem and the ovary is lateral and slightly anterior to the anterior testes just posterior to the ventral sucker. The uterus is predominantly anterior to the ventral sucker and is the most distinctive feature of the trematode.