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At least 19 recordsLinked to original sources
PubMed2005

Vectorial role of some dermanyssoid mites (Acari, Mesostigmata, Dermanyssoidea).

Among transmissible diseases, vectorial diseases represent a major problem for public health. In the group of acarina, while ticks are the most commonly implicated vectors, other arthropods and notably Dermanyssoidea are also involved in the transmission of pathogenic agents. Since the role of this superfamily is at present largely unknown, we have reviewed the vectorial role of these mites in the appearance, survival and propagation of pathogens. Various authors have shown that Dermanyssoidea are implicated in the transmission of both bacteria (Salmonella, Spirocheta, Rickettsia or Pasteurella) and viruses (equine encephalitis viruses, West Nile virus, Fowl pox virus, the virus causing Newcastle disease and tick borne encephalitis viruses or hantaviruses). Finally, some authors have also shown their role in the transmission of some protozoa and filaria. As the vectorial character of such mites has been more clearly demonstrated (Dermanyssus gallinae, Omithonyssus bacoti and Allodermanyssus sanguineus), it would be interesting to continue studies to better understand the role of this superfamily in the epidemiology of certain zoonoses.

Animals↗
PubMed1984

[Serum antibodies against Ixodes ricinus Spirochaeta in acrodermatitis chronica atrophicans (Herxheimer)].

Using indirect immunofluorescence, IgG antibodies against the recently detected Ixodes-ricinus-spirochaeta, which causes erythema chronicum migrans could be demonstrated in all 21 persons with acrodermatitis chronica atrophicans. Titers were from 1 : 64 to 1 : 1024, specific IgM antibodies were demonstrable in only 5 patients in a titer of 1 : 64. Even after treatment with penicillin high IgG antibody titers of up to 1 : 1024 were found. Fourfold decreases could be found only once for each IgG and IgM antibodies.l Serology indicates that acrodermatitis chronica atrophicans as well as erythema chronicum migrans is caused by the Ixodes-ricinus-spirocheta.

Acrodermatitis↗
PubMed2006

[Intrauterine infections].

A broad variety of microorganisms are capable of causing fetal infections. Among viral agents prominent are the human cytomegaly virus (HCMV), herpes simplex virus (HSV), human immundeficiency virus (HIV), varicella, herpes zooster, rubella, parvovirus B19, measles and the hepatitis B and C viruses. Protozoa such as toxoplasma and spirocheta pallida, causing congenital syphilis are equally important. Bacterial infections are responsible for in uterus aquired listeriosis, tuberculosis, and group B streptococcus infections. Fungi including candida albicans complete the circle of infections pathogens. Infectious microrganisms may reach the fetus through the placenta are may ascend through the birth canal. The quoted pathological agents threaten the health and life of the fetus directly by the biological derangements they cause and also by inducing abortion or premature birth. The clinical manifestations include retarded growth, central nervous system damage and skin lesions. The invariable therapeutic measures vary but in general, are limited value in cases of in utero acquired infections.

Bacterial Infections↗
PubMedDate not supplied

[The taxonomic aspects of the transmission of the causative agent of Lyme disease].

According to world literature data 17 species of ixodid ticks have been studied for natural infection with the Lyme disease agent. Analysis of the data on the level of the infection, transovarial and transphase transmission has shown that main biological vectors of Borrelia burgdorferi are the species of the subgenus Ixodes s. str. - I. ricinus, I. persulcatus (Eurasia), I. dammini, I. pacificus (North America). Potential vectors are I. scapularis, I. dentatus, Amblyomma americanum, Dermacentor variabilis. Single isolations were registered for I. neotomae, Haemaphysalis leporispalustris, D. occidentalis. Nonidentified spirocheta was isolated from A. americanum, D. variabilis, D. parumapertum, Rhipicephalus sanguineus. No agent was isolated from I. cookey, D. albipictus, R. reticulatus, H. concinna. On the basis of comparative and ontogenetic data the species from a group of main vectors: I. ricinus, I. persulcatus, I. pacificus had been attributed by me to the phyletic group persulcatus before Lyme disease was discovered and its causative agent isolated. The question whether I. scapularis belongs to the group persulcatus was also discussed at that time but left open due to somewhat aberrant structure of gnathosoma at preimaginal phases (Filippova, 1969, 1971, 1973). 6 Palaearctic, 2 Indomalayan and 3 Nearctic species were referred to the group persulcatus at the time. I. dammini was described later, in 1979. Gnathosoma of its preimaginal phases has an intermediate structure between I. scapularis and other species of the group persulcatus. Sexually mature phase and nymph of I. dentatus have much in common with Palaearctic members of the group, I. pavlovskyi, I. kazakstani, I. kashmicus. Preimaginal phases of I. scapularis and nymph of I. dentatus were studied by me on the collection material. Thus, it is possible to speak of the belonging of main vectors of B. burgdorferi to a common phyletic group within the subgenus Ixodes s. str. and, therefore, of common origin of ecological medium for the agent. At the same time each species of the vector is an evolutionally developed difference of ecological medium for B. burgdorferi. Roots of the group persulcatus could originate as far as in Paleocene before the land connection between North America and Europe disappeared. Conditions for the existence of recent species, however, appeared considerably later and their flourishing is dated by Pliocene. The main epidemiological role belongs now to I. ricinus, I. persulcatus, I. dammini, I. pacificus.(ABSTRACT TRUNCATED AT 400 WORDS)

Animals↗
PubMedDate not supplied

[Entamoeba histolytica stained with Warthin-Starry stain].

The Warthin-Starry stain have been used for coloring a different microorganism like spirochetas, Donovan bodies and Campylobacter and also melanin granules demonstration in soft tissues tumors. We started using the stain, as we know it, in order to stain the Histolytica amebas. We observed parasite stained black and brown as well as a good differentiation between endoplasm and ectoplasm where granular appearance, bacterial remnants and red cells were apparent. The stain was also usefull in differentiating amebas from histiocytes. We advice its use in amebiasis since is inexpensive and easy to do.

Animals↗
PubMedDate not supplied

[The course of early syphilis in morphine base-dependent rabbits].

Eleven rabbits made dependent on morphine base were observed which were infected with syphilis studying the clinical and serological course of the infection. The control group comprised five non-dependent rabbits infected with syphilis. After 30 days from the infection all animals were given procaine penicillin in daily doses of 75,000 mu/kg. The treatment was carried on for 20 days. In all animals the following serological tests: VDRL, IgG, FTA, TPHA, and TPI were done before the treatment and 1, 3, 6, and 12 months after it. Ulcerations at the site of injection of Nichols strain of spirochetae in all morphinedependent rabbits developed earlier (5-6 days after infection) than in controls (9-10 days), were much larger and persisted longer, while the antibody titres were lower, as a rule, in the morphine-dependent animals. The results presented justify the conclusion that the clinical and serological course of the early stages of syphilis is different in the morphine-dependent animals when compared with controls.

Animals↗
PubMed1979

[Acute necrotizing-ulcerative gingivitis in young men].

Acute necrotizing ulcerative gingivitis is a disease in which the bacilli of the flora normally found in the buccal cavity (fusiform bacilli and spirochetae) play a role. This type of gingivitis occurs relatively frequently in young men. The frequency of the disease tends to peak in the winter. We examined 72 young men between the ages of eighteen and twenty-one with acute necrotizing ulcerative gingivitis, fever and swelling of the regional lymph nodes for possible noxas. All of the individuals were smokers: approximately 3/4s of the group smoked more than 60 cigarettes per day. Roughly half of the individuals examined showed extremely poor oral hygiene or underlying psychological or physical stress at the onset of the disease. Dentitio difficilis and alcohol abuse however appeared to be less important factors. Symptomatic measures, such as mouthwash and oral hygiene, proved to be effective therapy. Diseases and disorders of internal structures of the body could not be diagnosed in any of these individuals.

Adolescent↗
PubMed1995

Chronic lyme disease in the rhesus monkey.

BACKGROUND: We have previously reported the clinical, pathologic, and immunologic features of "early" Borrelia burgdorferi infection in rhesus monkeys (3). We have now evaluated these features during the chronic phase of Lyme disease in this animal model. EXPERIMENTAL DESIGN: Clinical signs, and pathologic changes at the gross and microscopic levels, were investigated 6 months post-infection in several organ systems of five rhesus macaques (Macaca mulatta), which were infected with Borrelia burgdorferi by allowing infected Ixodes scapularis nymphal ticks to feed on them. A sixth animal was used as an uninfected control. Borrelia antigens recognized by serum antibody were identified longitudinally by Western blot analysis, and C1q-binding immune complexes were quantified. Localization of the spirochete in the tissues was achieved by immunohistochemistry and in vitro culture. The species of spirocheta cultured was confirmed by the polymerase chain reaction. RESULTS: Chronic arthritis was observed in five out of five animals. The knee and elbow joints were the most consistently affected. Articular cartilage necrosis and/or degenerative arthropathy were the most severe joint structural changes. Synovial cell hyperplasia and a mononuclear/lymphocyte infiltrate were commonly seen. Nerve lesions were also observed, including nerve sheath fibrosis and focal demyelinization of the spinal cord. Peripheral neuropathy was observed in five out of five animals and could be correlated in the most severely affected monkey with the presence of higher levels of circulating immune complexes. Differences in disease severity did not correlate with differences in the antigens recognized on Western blot analysis. CONCLUSIONS: B. burgdorferi infection in rhesus macaques mirrors several aspects of both the early and chronic phases of the disease in humans. This animal model will facilitate the study of the pathogenesis of Lyme arthritis and neuroborreliosis.

Animals↗