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N J Ryan

Publications and source records attributed to N J Ryan.

18 recordsLinked to original sources
PubMed1999

Combined infection of Norwalk-like virus and verotoxin-producing bacteria associated with a gastroenteritis outbreak.

Detection of multiple pathogens, particularly a combination of viruses and bacteria, is infrequently documented in outbreaks of gastroenteritis. This paper reports the presence of Norwalk-like virus (NLV) and enterohaemorrhagic verotoxin-producing Escherichia coli in one individual, and NLV and verotoxin-producing Aeromonas sobria in another individual, both part of a large gastroenteritis outbreak. The causes of gastroenteritis in such outbreaks may be more complex than previously thought.

Aeromonas↗
PubMed1997

Primary follow-up care in a multidisciplinary setting enhances catch-up growth of very-low-birth-weight infants.

OBJECTIVE: To determine the impact of multidisciplinary primary care follow-up, which included the services of a registered dietitian, on growth outcomes of very-low-birth-weight (VLBW) infants. DESIGN: Data were obtained retrospectively from medical records. Forty-two infants receiving follow-up care on an as needed basis from the general pediatric clinic were compared with 33 infants receiving multidisciplinary follow-up care that included routine nutrition intervention from the comprehensive care clinic. Comparisons were made in weight, length, and head circumference measurements; growth rates; and catch-up growth (defined as > or = 5th percentile on growth charts of the National Center for Health Statistics attained by 12 months growth-corrected age). SUBJECTS: VLBW infants (< or = 1,500 g at birth) were selected from both follow-up groups. STATISTICAL ANALYSIS: Chi 2 Analysis compared the proportions of infants in each group who achieved catch-up growth. Unpaired t tests compared group means in weight, length, and head circumference measurements and growth rates. RESULTS: The two groups differed significantly in the number of infants exhibiting catch-up growth for length and head circumference. At 8 months growth-corrected age, 7 (28%) of the general pediatric clinic infants were at the 5th percentile or greater for length compared with 21 (64%) of the comprehensive care clinic infants (P < .01); 15 (60%) of the general pediatric clinic group and 30 (91%) of the comprehensive care clinic group were at the 5th percentile or greater for head circumference (P < .05). At 12 months growth-corrected age, 12 (57%) of the general pediatric clinic infants and 26 (87%) of the comprehensive care clinic infants were at the 5th percentile or greater for length (P < .05); 11 (52%) of the general pediatric clinic infants and 27 (90%) of the comprehensive care clinic infants were at the 5th percentile or greater for head circumference (P < .05). APPLICATIONS: Multidisciplinary primary care follow-up that includes the services of a registered dietitian for nutrition intervention can enhance the catch-up growth of VLBW infants through 12 months growth-corrected age.

Comprehensive Health Care↗
PubMed1997

Cryptosporidiosis in patients with AIDS.

Cases of cryptosporidiosis in patients with the acquired immunodeficiency syndrome (AIDS) residing in Melbourne over a 6-year period (1990-1995) are described. During this period 85 cases occurred, while 979 new AIDS diagnoses were notified. Over this period temporal clustering in cryptosporidial detection was evident (P=0.007), but the pattern was not statistically associated with the season, rainfall (P=0.88), mean average maximal temperature (P=0.15) or mean average minimal temperature. Further studies should identify these risk factors and provide an opportunity to prevent this devastating disease.

AIDS-Related Opportunistic Infections↗
PubMed1995

In vitro growth of the microsporidian Septata intestinalis from an AIDS patient with disseminated illness.

A new species of microsporidian, Septata intestinalis, was recently recognized as an opportunistic pathogen of AIDS patients. In this study, it was cultured from the nasopharyngeal aspirate of a human immunodeficiency virus type 1-infected patient with disseminated microsporidiosis. In human embryonic lung cells exposed to S. intestinalis, a cytopathic effect appeared within 28 days as foci of rounded up cells. Thin-section electron microscopy showed a variety of developmental stages of the microsporidium within parasitophorous vacuoles. In monocyte-derived macrophages, evidence of infection and development of the parasite was demonstrated by light and electron microscopy. In both infected human embryonic lung cells and monocyte-derived macrophages, a network of septa separated individual spores. Partial sequencing of the RNA small-subunit gene (16S rDNA gene) confirmed the identity of this parasite as S. intestinalis. This is the first report of the isolation of S. intestinalis in vitro and provides evidence that the parasite can be disseminated by macrophages.

AIDS-Related Opportunistic Infections↗
PubMed1993

A new trichrome-blue stain for detection of microsporidial species in urine, stool, and nasopharyngeal specimens.

Detection of microsporidia in clinical specimens has relied on electron microscopy, histology, or staining. This article describes further alterations to the modified trichrome staining method which make it easier to identify microsporidial spores. The changes are a decrease in the phosphotungstic acid level and the substitution of a colorfast counterstain, aniline blue, for the fast green of the original stain. The modified stain provides good contrast between microsporidial spores and background material including human and fungal cells. Stool specimens from 139 human immunodeficiency virus-seropositive patients revealed that 5 patients were infected with Enterocytozoon bieneusi and 6 patients had larger spores. Thin-section electron microscopy of the larger spores showed a structure consistent with that of either Encephalitozoon or Septata species. Three of the patients with Encephalitozoon- or Septata-like species had disseminated infection, with spores detected in nasopharyngeal aspirates and urine samples.

AIDS-Related Opportunistic Infections↗
PubMed1989

Concurrence of limb girdle muscular dystrophy and myasthenia gravis.

We describe a case of limb girdle muscular dystrophy with associated myasthenia gravis. This association has not been previously noted in the literature. The unusual feature of the case was that symptoms coexisted for several years before a correct diagnosis was made. The diagnosis was based on the clinical picture and the results of the muscle biopsy and electrophysiologic testing. This case serves to illustrate the fact that a separate problem should be considered when the clinical picture is not compatible with the underlying diagnosis.

Biopsy↗
PubMed1984

Neonatal Citrobacter meningitis: pathogenesis of cerebral abscess formation.

In 2 premature infants with brief survival, the major pathological feature of Citrobacter meningitis consisted of vasculitis and infarction with necrosis and liquefaction of large portions of the white matter of the hemispheres. Areas of decreased density demonstrated on computed tomographic head scan represented infarction with necrosis, liquefaction, and cavitation and not a classic abscess. This finding has clinical significance, because surgical drainage of liquefied infarcts is rarely indicated and could further damage the relatively preserved cortex.

Brain Abscess↗
PubMed1984

Meningococcal meningitis in children: clinical comparison of disease produced by the minor and major serologic groups of Neisseria meningitidis.

Since 1972, there has been an increased incidence of meningococcal disease due to the minor serologic groups, "serogroups," of Neisseria meningitidis. Few cases, however, have been reported in pediatric patients. We present 24 cases of meningococcal meningitis, ten of them (42%) due to serogroups X, Y, and Z N meningitidis. We believe these cases to be the largest group of pediatric patients with such meningitis thus far reported. The clinical disease produced by the minor serogroups was indistinguishable from that produced by the major serogroups. Our experience supports previous published reports that severe meningococcal disease does occur with the minor serogroups of N meningitidis, and this increasing incidence may be of major importance if vaccination programs are to be effective in controlling epidemic meningococcal disease.

Adolescent↗
PubMed1980

Reye's syndrome.

Explore the source record for details and available documents.

Child↗
PubMed1979

Aflatoxin B1; its role in the etiology of Reye's syndrome.

Seven cases of Reye's syndrome in which aflatoxin B1 was isolated from the blood or liver or both are presented. In two cases aflatoxin B1 was found in the blood during the acute phase of the disease; a finding not previously reported. In six cases aflatoxin B1 was recovered from autopsy specimens of liver. A number of case reports linking aflatoxin B1 to Reye's syndrome have appeared in the literature but until now only one case had been reported from the United States. Aflatoxin B1 and its possible role in the etiology of Reye's syndrome is discussed. It is concluded that Reye's syndrome is the result of multiple interrelated factors.

Aflatoxins↗
PubMed1978

Enterotoxin-producing Escherichia coli and diarrhoea among newborn babies in Darwin.

Specimens of Escherichia coli O119B14 isolated from 13 newborn babies during an outbreak of diarrhoea in Darwin Hospital were tested for their ability to produce enterotoxin. Of the 13 isolates tested none was found to produce heat-labile enterotoxin. However, isolates from two of the five diarrhoeal faecal specimens were found to produce moderate levels of heat-stable enterotoxin (ST). It seems like that ST-producing strains of E. coli were responsible for the diarrhoea.

Australia↗
PubMed1977

Neurological evaluation of the newborn.

The neurological examination is an integral part of the evaluation of the newborn infant. In too many instances the infant is dismissed from the nursery as 'normal' when,in fact, little or no effort has been expended to determine the body's neurological status. The neurological deficits overlooked often do not become overt until a much later age. Early detection can prevent the mental anguish that plagues the parents who must be told that their 'normal' infant has significant neurological problems. In some instances early diagnosis may lead to a better ultimate prognosis. We have presented a simple scheme for the neurological evaluation of the full-term infant and hope that it will be useful in encouraging pediatricians to assess neurological status.

Cephalometry↗