Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0023380 (lethargy)
 5,697 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Three calves (Nos. 1, 2 = 7 days old; No. 3 = 21 days old) were inoculated subcutaneously with virulent Rift Valley fever (RVF) virus. All calves became viremic and clinically ill, but the two 7-day-old calves were moribund and were euthanatized subsequently on post-inoculation day (PID) 3. Highest viral titers were measured in the serum, with lesser concentrations in the brain, heart, spleen, and liver of these animals. Viral antigens were detected by immunohistochemical analysis only in the livers, where positive staining was localized in coalescing foci of hepatocellular necrosis. The 21-day-old calf appeared to recover after viremia and pyrexia but became lethargic and ataxic and was euthanatized on PID 9. The calf was no longer viremic, and RVF virus was isolated only from the brain. Microscopic examination of the central nervous system revealed diffuse perivascular infiltrates of lymphocytes and macrophages, multifocal meningitis, and focal areas of neuronal necrosis and aggregates of macrophages, lymphocytes, and neutrophils throughout all regions of the brain and cervical spinal cord. There was positive immunohistochemical staining for viral antigens within the cytoplasm of neurons and glial cells throughout the central nervous system. Thus, RVF virus can cause encephalomyelitis in calves, and the specific virologic diagnosis can be made by immunohistochemical localization of viral antigens in formalin-fixed tissues.
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PMID:Rift Valley fever virus-induced encephalomyelitis and hepatitis in calves. 144 95

In this survey for the presence of the feline leukaemia virus (FeLV) in the Singapore domestic cat population, the sera of two different groups of unvaccinated mainly short haired cats which were over 6 months old were sampled. The FeLV enzyme-linked immunoadsorbent assay (ELISA) diagnostic test kit was used to detect the presence of the FeLV group specific (gs) antigens in the blood of cats. Of the 345 clinically healthy cats surveyed, 34 sera (9.9%) were found to be positive and of the group of 123 cats with clinical signs such as chronic wasting, marked by anaemia, anorexia and lethargy, 33 sera (26.8%) were found to be positive. From the time of diagnosis of a viraemia, 70% of cats will die within 20 months. The results are therefore indicative that annually a small proportion of cats in the local environment will die from a FeLV infection. This survey reflects the natural distribution of an infectious oncovirus in a susceptible host population which is unaffected by any control programme to interfere with the normal sequence of events of host virus interactions.
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PMID:A survey of the feline leukaemia virus in Singapore. 256 Mar 57

A 2-phase study was conducted to evaluate the ability of the NEB-1 strain of porcine reproductive and respiratory syndrome virus (PRRSV) to potentiate common bacterial pathogens of swine. In phase I, 25 of 50 4-5-week-old specific-pathogen-free (SPF) pigs were exposed to NEB-1 PRRSV (day 0). Seven days after virus inoculation, 8 groups received 1 of 4 bacterial pathogens: Haemophilus parasuis, Streptococcus suis, Salmonella cholerasuis, and Pasteurella multocida. The ability of NEB-1 PRRSV to produce clinical disease, viremia, neutralizing antibody, gross and microscopic lesions and to potentiate bacterial pathogens was assessed. Response to NEB-1 PRRSV was similar among inoculated pigs; prolonged hyperthermia, lethargy, mild to moderate dyspnea, and cutaneous erythema were consistent clinical signs. No clinical differences were observed in groups after bacterial challenge. Virus was isolated from serum at weekly intervals through the end of the study, and all PRRSV-inoculated pigs had seroconverted by study termination. Two of 5 pigs died in non-PRRSV-inoculated groups challenged with H. parasuis and Streptococcus suis. Mortality in PRRSV-infected pigs was limited to 1 of 5 pigs from the Salmonella cholerasuis-challenged group. Gross lesions were seen in pigs dying after inoculation in H. parasuis- and Streptococcus suis-inoculated groups, in Salmonella cholerasuis- and P. multocida-challenged pigs, and in 1 non-PRRSV-inoculated control pig. Microscopic lesions consisted of mild to moderate proliferative interstitial pneumonia, nonsuppurative myocarditis, lymphoid hyperplasia, and nonsuppurative encephalitis in PRRSV-inoculated pigs. Findings in phase I indicated that NEB-1 PRRSV does not potentiate bacterial disease while inducing consistent clinical signs, viremia, seroconversion, and microscopic lesions.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:Porcine reproductive and respiratory syndrome: NEB-1 PRRSV infection did not potentiate bacterial pathogens. 757 44

A boy, 4 years, 9 months of age, presented with acute hemiplegia, lethargy, ataxia, and dysarthria 24 hours prior to the eruption of typical varicella exanthem. Magnetic resonance imaging findings were typical of multiple cerebral ischemic infarcts. It is suggested that during the period of secondary viremia varicella zoster virus invaded the cerebral blood vessels causing vasculopathy and cerebrovascular infarcts.
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PMID:Pre-eruptive neurologic manifestations associated with multiple cerebral infarcts in varicella. 777 18

We studied 57 infants < or = 14 days of age referred for possible enterovirus (EV) infection to assess the accuracy of that clinical diagnosis and describe the natural history of neonatal EV infection. Twenty-nine neonates proved to have EV infection, 23 had illnesses compatible with (but not proven to be) EV infection, and 5 had alternative diagnoses: bacterial infections (2); herpes simplex virus infection (1); and metabolic disorders (2). Neonates with proved EV infection were generally full term and had uncomplicated immediate postnatal periods but high percentages of ill contacts. Neonatal symptoms and signs included fever, irritability, anorexia, lethargy, hypoperfusion, rash, jaundice and respiratory findings. Laboratory abnormalities included cerebrospinal fluid (CSF) pleocytosis, chest radiograph infiltrates, abnormal urinalyses and elevated transaminases. EVs were most commonly isolated from CSF and rectum/stool but also frequently from serum and urine. Five EV-infected patients had severe multisystem disease (pneumonitis, hepatitis, thrombocytopenia, bleeding and meningitis), requiring supportive care and lengthy hospitalizations. All survived, 2 with residual hepatic dysfunction. Markers of severe disease included: early age of illness onset (especially Day 1 of life); maternal viral symptoms at delivery; absence of fever and irritability; tachypnea; lethargy; abdominal distension; hepatomegaly; and positive serum viral culture. These data support conservative management of ill infants < or = 2 weeks of age and suggest that antiviral therapy for neonatal EV infection would be optimally targeted at infants with early onset illness, multisystem disease and/or viremia.
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PMID:Profile of enterovirus disease in the first two weeks of life. 828 18

An epidemic of enterovirus 71 (EV71) infection compatible with hand, foot and mouth disease and associated with high morbidity and mortality occurred in Taiwan in 1998. We recruited 90 patients (50 males, 40 females) with definite EV71 infections for clinical and laboratory analysis. The neurological signs and symptoms, all of which occurred during the febrile period, in patients with central nervous system (CNS) involvement (aseptic meningitis, encephalitis or myelitis) were myoclonic jerks (23/33), vomiting (10/33), ataxia (7/33), lethargy (6/33), seizure (4/33) and tremor (2/33). Patients with CNS involvement had longer durations of fever (4.6+/-0.2 vs. 3.1+/-0.3 d; p <0.01) and a higher white blood cell count (12,512+/-658 vs. 10,607+/-409 cells/mm3; p = 0.01) than patients without CNS involvement. The case fatality rate in patients with CNS involvement was 4/33 (12%), whereas no fatalities (0/57) occurred in patients without CNS involvement. Six of 11 patients subjected to MRI showed a high intensity T2-weighted signal in the brainstem. A nested fluorescent RT-PCR for detection of virus in throat and stool specimens showed higher sensitivity than viral culture. Viremia was detectable using RT-PCR in 20% of cases (3/15), whereas no virus was isolated from culture or detected by RT-PCR in cerebrospinal fluid.
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PMID:Clinical manifestations and laboratory assessment in an enterovirus 71 outbreak in southern Taiwan. 1192 38

In this study we examine the safety, feasibility, and biodistribution of a tumor-selective mutant vaccinia (vvDD) and wild-type WR (vF13) vaccinia after delivery via intradermal or intravenous infection or isolated limb perfusion (ILP) in rhesus macaques. By intradermal inoculation, 10(6) PFU of vvDD caused a minimal skin reaction whereas vF13 caused marked erythema and necrosis with a peak indurated area of 108 cm2. By intravenous delivery, vvDD caused no clinical symptoms of viremia and no viral recovery from tissues, serum, saliva, urine, or feces. In contrast, vF13 caused symptoms of lethargy, anorexia, fever, and signs of viremia. Delivery of vF13 via ILP resulted in numerous cutaneous pox lesions localized solely to the perfused limb with high viral recovery in the perfused skin and muscle. ILP with vvDD resulted in no visible pox lesions and no clinical signs or symptoms of viremia. No long-term toxicity was identified after ILP with 10(9) PFU of vvDD, and no virus was recovered from any tissue, serum, saliva, urine, or fecal sample. These results suggest that vvDD appears to be safe in primates, and thus vvDD should be further investigated for clinical trial in human cancer patients.
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PMID:Intravenous and isolated limb perfusion delivery of wild type and a tumor-selective replicating mutant vaccinia virus in nonhuman primates. 1640 23

Eastern Screech Owls (EASOs) were experimentally infected with the pathogenic New York 1999 strain of West Nile virus (WNV) by subcutaneous injection or per os. Two of nine subcutaneously inoculated birds died or were euthanatized on 8 or 9 days postinfection (DPI) after <24 hr of lethargy and recumbency. All subcutaneously inoculated birds developed levels of viremia that are likely infectious to mosquitoes, with peak viremia levels ranging from 10(5.0) to 10(9.6) plaque-forming units/ml. Despite the viremia, the remaining seven birds did not display signs of illness. All birds alive beyond 5 DPI seroconverted, although the morbid birds demonstrated significantly lower antibody titers than the clinically normal birds. Cagemates of infected birds did not become infected. One of five orally exposed EASOs became viremic and seroconverted, whereas WNV infection in the remaining four birds was not evident. All infected birds shed virus via the oral and cloacal route. Early during infection, WNV targeted skin, spleen, esophagus, and skeletal muscle. The two morbid owls had myocardial and skeletal muscle necrosis and mild encephalitis and nephritis, whereas some of the clinically healthy birds that were sacrificed on 14 DPI had myocardial arteritis and renal phlebitis. WNV is a significant pathogen of EASOs, causing pathologic lesions with varying clinical outcomes.
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PMID:Experimental West Nile virus infection in Eastern Screech Owls (Megascops asio). 1686 76

The effects of a single-dose recombinant Porcine circovirus type 2 (PCV2) open reading frame 2 (ORF2) subunit vaccine were studied in a post-weaning multisystemic wasting syndrome (PMWS)-affected pig herd. A total of 1519 3-week-old piglets were allocated randomly into two treatment groups and either vaccinated against PCV2 or treated with a placebo. Study animals were followed from the time of vaccination until the end of finishing. Onset of PCV2 viraemia and clinical signs of PMWS (wasting, cough, dyspnoea, pallor and lethargy) were observed when animals were approximately 9-10 weeks old. Compared to placebo-treated animals, vaccinated animals had a significantly reduced PCV2 viral load and duration of viraemia (p < 0.0001). This reduction in viraemia was not affected by the level of maternal anti-PCV2 antibodies present at the time of vaccination. During the period of viraemia (10-26 weeks of age) vaccinated animals exhibited a 53% reduction in mortality rate (p = 0.0010), a 4.84 kg higher body weight gain (p < 0.0001) and a significant reduction in clinical signs (p < or = 0.0004). Furthermore, lung samples of vaccinated animals had a considerably reduced number of co-infections with PRRSV and Mycoplasma hyorhinis than lung samples of placebo-treated animals. These data indicate that vaccination against PCV2 alone protects pigs from clinical signs and co-infections associated with PMWS.
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PMID:Reduction of PMWS-associated clinical signs and co-infections by vaccination against PCV2. 1851 42

Newborn and 14-day-old mice inoculated subcutaneously with chikungunya virus (CHIKV) developed lethargy, difficulty walking, dragging of hind limbs, and reduced weight gain within 7-10 days after infection (PI). During the initial 6-7 days PI, the animals had viremia; high levels (10(6)-10(8) PFU) of CHIKV were also present in leg muscle. The virus persisted in muscle for several days after viremia disappeared. The major histopathologic changes were in skeletal muscle, which were focal necrosis and inflammation, followed by fibrosis and dystrophic calcification. Some mice also showed dystrophic calcification in the joint cartilage, but there were few deaths, and most of the animals eventually recovered. CHIKV antigen was shown by immunohistochemistry in the muscle for several weeks after infection. Based on the clinical and pathologic similarities with CHIKV infection in humans, young ICR and CD-1 mice offer a useful and realistic model for further study of the pathogenesis and treatment of CHIKV infection.
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PMID:An animal model for studying the pathogenesis of chikungunya virus infection. 1860 77


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