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Biomedical subjects

D Phillips

Publications and source records attributed to D Phillips.

244 records · Page 14Linked to original sources
PubMedDate not supplied

Solomon Islands dengue seroprevalence study--previous circulation of dengue confirmed.

Since there were no confirmed outbreaks of dengue on record an extensive search of available records and a seroprevalence study were undertaken to determine if there was evidence of past dengue virus infections in the Solomon Islands. Hospital and Health Department records revealed a suspected dengue outbreak in 1982 and deaths attributed to dengue in 1995 and 1996. Serum samples from blood donors were analyzed for the presence of IgG antibodies specific for flavivirus and dengue virus. A total of 39% of the 515 samples, predominantly from adult males from Honiara, demonstrated IgG antibodies specific for dengue; 28% (26 of 93) were monotypically positive by plaque reduction neutralization test for dengue 2 antibody and the remaining samples had antibodies to more than one dengue serotype. A good correlation was found between the presence of flavivirus and dengue IgG confirming that dengue virus had circulated in the past in the Solomon Islands.

Antibodies, Viral↗
PubMedDate not supplied

The epidemiology of bacterial meningitis.

BACKGROUND: The incidence by age and causative organism of bacterial meningitis are not known on a community basis. METHODS: The epidemiology of bacterial meningitis in a metropolitan county was studied by identifying all cases admitted to a hospital from 1983 through 1987. RESULTS: The overall incidence of bacterial meningitis was 5 per 100,000 person-years, but numbers of cases ranged from 40 per 100,000 for children younger than 5 years to 1.0 per 100,000 in adults aged between 16 and 64 years. No significant excesses of cases were found in male patients or in blacks. The predominant causative organism varied with age. Overall, Haemophilus influenzae was the most common causative organism, but 32 percent of cases were due to Streptococcus pneumoniae. Case fatality rates were high for S. pneumoniae (12.5 percent) and very high for the small number of elderly patients suffering from bacterial meningitis. CONCLUSIONS: Significant declines have occurred in the last decade in the incidence of bacterial meningitis in children, particularly in those younger than 5 years, and in disease caused by H. influenzae and group B streptococcus.

Adolescent↗
PubMedDate not supplied

Chronic gastric ischemia. A cause of abdominal pain or bleeding identified from the presence of gastric mucosal acidosis.

Acidosis in gastric mucosa (pHi less than 7.32) was evaluated as a diagnostic test for gastric ischemia, using 80 asymptomatic subjects as controls. Mucosal acidosis was found in 6 patients with abdominal pain and 1 with gastrointestinal bleeding. Three had occlusive disease of 2 or more visceral arteries, 3 had occlusive disease of the celiac axis alone, and 1 had an occluded portal vein. One patient had infarcted gut. The abnormal pHi (7.10 +/- 0.11, mean +/- SD) in those with pain was returned to normal levels (7.43 +/- 0.08, p = 0.0003) and the symptoms relieved by revascularization. The abnormal pHi (6.84 +/- .04) in the patient who bled was restored to normal levels (7.48 +/- .03, t = 9.69, p less than .0001) and the bleeding stopped by a central splenorenal shunt. Measurements of pHi in gastrointestinal mucosa may be used as an objective test for evaluating patients suspected of having chronic gastrointestinal ischemia.

Abdominal Pain↗
PubMedDate not supplied

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Female↗
PubMedDate not supplied

Identification and localization of copper-zinc superoxide dismutase gene expression in rat testicular development.

Reactive oxygen species are highly toxic agents that appear to have an important role in male infertility. In order to understand the potential for the testis to be protected from reactive oxygen, the mRNA levels of the natural reactive oxygen scavenger, copper-zinc superoxide dismutase (SOD), were determined in testes and other organs in rats using northern analysis and in situ hybridization. Northern analysis of total RNA from organs of 60-day-old rats demonstrated an SOD mRNA with a transcript length of 0.77 kb; its concentration was highest in the kidney, liver, testis, and epididymis. In testis, northern analysis of total RNA demonstrated two mRNA transcripts of 0.77 kb and 0.94 kb. The concentrations of the 0.77-kb transcript varied only slightly between 10 and 100 days of age. In contrast, the 0.94-kb transcript became detectable by northern analysis between 30 and 40 days of age, then its concentration rose progressively to peak at 60 days. In situ hybridization studies demonstrated a uniform distribution of SOD mRNA within seminiferous tubules of prepubertal rats at 10 days of age and a heterogeneous, stage-specific pattern in older animals. In mature rats, the highest level of SOD mRNA was detected in tubules just prior to spermiation (stages VI-VIII). In conclusion, two SOD mRNA transcripts were identified in the rat testes that followed significantly different patterns of expression during development. In situ hybridization studies revealed that accumulation of the SOD mRNA in the seminiferous tubule was stage specific. These data suggest that SOD may play an important role during testicular development and spermatogenesis in rats.

Aging↗