Search PubMed⌕ Search

Biomedical subjects

N Berry

Publications and source records attributed to N Berry.

60 records · Page 4Linked to original sources
PubMedDate not supplied

Low peripheral blood viral HIV-2 RNA in individuals with high CD4 percentage differentiates HIV-2 from HIV-1 infection.

OBJECTIVES: To elucidate why the virulence of HIV-1 and HIV-2 infections differ in West African populations. STUDY DESIGN/METHOD: Peripheral blood plasma virion RNA and cellular proviral DNA levels were measured in a cross-section of 59 HIV-1 and 49 HIV-2 singly infected individuals representing all stages of infection in The Gambia, West Africa. Novel reverse transcriptase polymerase chain reaction (RT-PCR) assays specific and sensitive for virus quantification of non-clade B HIV-1 and HIV-2 infections were used. RESULTS: HIV-1 and HIV-2 proviral and plasma RNA levels were inversely correlated with CD4+ count for both infections with cellular proviral load similar at each stage of infection. Critically, up to three-fourths of HIV-2-infected individuals with high CD4 percentages (> 28%) had undetectable (< 500 copies/mL) levels of peripheral blood HIV-2 RNA in contrast to HIV-1-infected individuals who had readily detectable plasma virus at all stages of infection (P < .0001). Plasma RNA levels were similar in the intermediate and end stages of infection, indicating similar replication potential for both viruses. In the cross-section of HIV-1- and HIV-2-infected patients studied, the data indicate a wider dynamic range of HIV-2 RNA in vivo compared with HIV-1. DISCUSSION: Low levels of HIV-2 replication and virion expression characterize individuals with high CD4+ lymphocyte counts, suggesting that a very different dynamic equilibrium exists between virus and host for HIV-2 compared with HIV-1. By analogy with HIV-1, our data implicate a considerably lower turnover of HIV-2 virion RNA in vivo with a markedly reduced production of infectious genomes in individuals during the subclinical phase of infection. CONCLUSION: The lower levels of virion expression of HIV-2 infections in vivo are compatible with observed differences in the natural history of HIV-1 and HIV-2 infections, relating to overall differences in the pathogenesis and disease progression of the two infections.

Acquired Immunodeficiency Syndrome↗
PubMedDate not supplied

One stop rectal bleeding clinic: the coventry experience.

Among most patients attending a rectal clinic, rectal bleeding is a common presenting feature. In most patients, the cause is attributed to a benign lesion. In a small percentage, the cause is neoplastic, and for this reason, rectal bleeding merits further study. Left-sided tumors account for the majority of these tumors and are within the reach of a flexible sigmoidoscopy. This study aimed at examining the diagnostic performance of the one stop rectal clinic in Coventry. Between November 2001 and May 2002, 250 consecutive patients were seen in the one stop rectal bleeding clinic of a tertiary referral hospital. Patients were asked of the nature of rectal bleed and altered bowel habits and were examined by digital rectal examination, with a proctoscopy and rigid sigmoidoscopy before either a full colonoscopic examination or flexible sigmoidoscopy with a completion Barium enema. During the study period, colorectal cancer was detected in 4 patients (1.6%), adenomatous polyps in 36 patients (14.4%), and ulcerative colitis in 8 patients (3.2%). In 98 patients (39.2%), no abnormality was present, and in the remaining patients, diverticulosis (n = 60; 24%) and hemorrhoids were present (n = 44; 17.6%).

Adult↗