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Biomedical subjects

P S Rice

Publications and source records attributed to P S Rice.

16 recordsLinked to original sources
PubMed2002

Early detection of cytomegalovirus (CMV) infection in bone marrow transplant patients by reverse transcription-PCR for CMV spliced late gene UL21.5: a two site evaluation.

BACKGROUND: Bone marrow transplant (BMT) patients at risk of developing cytomegalovirus (CMV) pneumonitis are identified routinely by the early detection of virus in blood. For early diagnosis of CMV infection, the RNA-based approach demonstrates advantages when compared with the current CMV antigen and DNA detection methods. OBJECTIVES: We have evaluated our previously developed reverse transcription-polymerase chain reaction (RT-PCR) to a spliced late CMV gene (SLG; J. Virol. Methods 56 (1996), 139) to monitor CMV infection in BMT patients at two clinical sites. The diagnostic value of the SLG RT-PCR was compared with the routine CMV antigen and DNA detection methods. STUDY DESIGN: Weekly blood samples from BMT patients were tested for CMV during the first 3 months post-transplant. The qualitative SLG RT-PCR, semiquantitative DNA PCR, and viral antigen tests were compared. The RNA and DNA PCR results were analysed in terms of their temporal relationship and consistency of CMV detection and compared with CMV infection diagnosed by viral antigen tests. RESULTS: Of the 101 BMT recipients studied, 25 developed CMV antigenemia and/or DNAemia resulting in symptomatic infection in two patients. All CMV PCR-positive patients were either CMV seropositive pretransplant or received marrow from seropositive donor. The highest incidence of CMV infection was seen in seropositive recipients (R+) irrespective of the donor's status. Detection of CMV infection by SLG RNA preceded CMV DNA detection by 0-2 weeks (median 1 week) and CMV antigen detection by 0-8 weeks (median 3 weeks). Once detected, the SLG RNA remained consistently positive before antiviral treatment was commenced. Both the SLG RNA and CMV DNA detection methods had the same clinical sensitivity, specificity, positive and negative predictive values of 100, 94, 80 and 100%, respectively. CONCLUSIONS: The RT-PCR for SLG RNA proved to be the earliest indicator of CMV infection in BMT patients demonstrating a sustained pattern of CMV detection during the 3 months post-transplant period. Although very similar in its diagnostic performance to CMV DNA PCR the SLG RNA RT-PCR does not require quantitation and provides an efficient and ongoing indication of active CMV infection.

Adolescent↗
PubMed2000

HIV seroprevalence by anonymous testing in patients with Mycobacterium tuberculosis and in tuberculosis contacts.

Having witnessed a large increase in Mycobacterium tuberculosis notifications in south London, we wanted to ascertain the prevalence of HIV and tuberculosis co-infection in our patients. All patients with tuberculosis and their contacts were anonymously tested for HIV in blood and saliva, respectively. 11.4% of patients (from various demographic groups) with tuberculosis who attend chest clinics in south London are HIV positive. In addition, 5% of individuals seen in the tuberculosis contact screening clinics and 4% new entrants are HIV positive. All patients with Mycobacterium tuberculosis, irrespective of background, should be urged to have an HIV test.

AIDS Serodiagnosis↗
PubMed2000

High prevalence of human papillomavirus type 16 infection among children.

Infection with high-risk human papillomaviruses (HPV), is the most significant risk factor for cervical cancer and it may be possible to prevent this malignancy by immunisation. Before immunisation programmes can be designed, however, it is necessary to know the age of acquisition and all routes of infection for these viruses. Sexual transmission is well documented and vertical transmission has also been demonstrated, although the frequency of transmission remains controversial. We previously showed that vertical transmission frequently results in persistent infection, and now present data on the prevalence of HPV-16 DNA (the most prevalent high-risk HPV type) in healthy children. Buccal samples from 267 healthy children aged 3-11 years were tested for HPV DNA by generic PCR (MY09/MY11), and a HPV-16 specific nested PCR. Reverse transcriptase (RT)-PCR was used to determine the prevalence of transcriptionally active HPV-16 infection in a subset of children. HPV-16 DNA was detected by nested PCR in 138 of 267 (51.7%) samples, whereas HPV DNA was detected in only 45 (16.8%) specimens by generic PCR, that has a lower analytical sensitivity. There were no significant differences in prevalence according to age or sex. Early region mRNA was detected by RT-PCR in six (11.3%) of 53 HPV-16 E5 DNA positive samples. HPV-16 E5 DNA sequences from 10 children confirmed the identity of the sequences detected and identified 13 HPV-16 variants.

Child↗
PubMed1998

Exposure to blood borne viruses and the hepatitis B vaccination status among healthcare workers in inner London.

Occupational exposure to blood borne viruses was examined during one year at a London teaching hospital. A total of 236 incidents occurred of which 83% were related to sharps, 32% were clearly avoidable, and 7% involved an infected source patient. Overall uptake of hepatitis B vaccine was 78% but it was particularly low in paramedical (70%) and domestic staff (45%). Continued effort needs to be applied to improve uptake of hepatitis B vaccine and to maintain high standards of control of infection.

Blood-Borne Pathogens↗
PubMed1996

A school outbreak of parvovirus B19 infection investigated using salivary antibody assays.

An outbreak of parvovirus B19 infection at a primary school was investigated using saliva samples. Antibody capture immunoassays for salivary B19 IgG and IgM were developed using a recombinant B19 antigen and monoclonal antibody to B19 virus. Evaluation of the salivary IgG assay using paired serum and saliva samples from 43 staff at St Thomas' Hospital showed that it had a sensitivity of 100% and a specificity of 95%. Evaluation of the salivary B19 IgM assay using 87 paired blood and saliva samples from a study of general practitioner rubella notifications showed it had a sensitivity of 60% and a specificity of 98%. Using the salivary assay the level of B19 IgG within 2 weeks of the start of the outbreak ranged from 5-33% in children and 29% in staff. By detecting salivary B19 IgM and/or B19 IgG seroconversions, attack rates of 8-50% in children in different classes and 47% in staff were observed. Household transmission was also studied and an attack rate of 45% was recorded in 11 susceptibles. After the outbreak, the level of B19 IgG in children with the highest attack rates was 60-70%, similar to that seen in adults in the UK. This study highlights the risk of B19 infection in an institutional setting and shows that saliva samples are a useful alternative to blood.

Adolescent↗
PubMed1993

Coxiella burnetii serology in granulomatous hepatitis.

Granulomatous hepatitis as the sole manifestation of acute Q fever has been reported only rarely, although minimal hepatic dysfunction may be common in the acute disease. In this paper we report two patients with acute Q fever who presented with hepatitis; one of whom had granulomatous hepatitis on liver biopsy. We discuss the serological diagnosis of acute and chronic Q fever particularly in relation to hepatitis.

Antibodies, Bacterial↗
PubMed1993

Colonic lavage solutions: plain versus flavored.

Many patients dislike the taste of the oral gastrointestinal lavage solutions utilized prior to colonoscopy. Specifically, patients dislike the salty taste and the quantity of the polyethylene glycol-electrolyte solution that they are required to ingest. In an attempt to reduce the salty taste and potentially improve patient compliance and tolerance of the preparation, flavoring was added to the lavage solution. Fifty-six patients received standard or flavored polyethylene glycol-electrolyte lavage solution in random order prior to colonoscopy. In group I, lemon-flavored Colyte was compared with standard Colyte: 93% (25/27) of subjects preferred the flavored solution. In group II, standard Colyte was compared with lemon/lime-flavored Colyte, and 80% (8/10) of subjects preferred standard Colyte. In group III, lemon-flavored Colyte, standard Colyte, and NuLYTELY were compared. Ninety percent (17/19) of the subjects preferred lemon-flavored Colyte, 10% of the subjects preferred standard Colyte, and none of the subjects preferred NuLYTELY. Overall, patients preferred lemon-flavored solution over other solutions.

Adult↗
PubMed1992

Diagnosis of cytomegalovirus infection in heart transplant recipients.

In a prospective study eight (47%) heart transplant recipients had recurrent cytomegalovirus (CMV) infection. Of these, five had received hearts from seropositive donors. Neither serology nor virus isolation from urine was reliably associated with clinical CMV infection, but a high CMV IgM index correlated with CMV infection.

Antibodies, Viral↗
PubMed1991

Z's, P's, and double blinds: making sense of published research.

Most nurses are inadequately prepared for critically analyzing research. Gastrointestinal "nursing" encompasses a diverse group which includes registered nurses, licensed practical and vocational nurses and trained technicians. The parameters of practice sometimes overlap within this group regardless of formal educational background. It is imperative to the safety of ourselves and our patients and to the advancement of gastrointestinal nursing practice that we are capable of making intelligent, informed decisions regarding the research and reports we are offered. This paper discusses the key elements of research methodology to enhance the interpretive skills of the reader.

Data Interpretation, Statistical↗
PubMed1989

Understanding idiopathic chronic constipation: an understated problem.

Constipation is a common problem and is frequently taken for granted by both the lay and medical populations. Although sometimes easily resolved it can prove to be a lifelong, debilitating problem, both medically and sociologically. Most frustrating is the category of idiopathic chronic constipation, a problem without identifiable etiology and diagnosed by exclusion. This paper takes an in-depth view of chronic and more specifically, idiopathic chronic constipation, discussing etiology, diagnosis and treatment. Two case histories are presented illustrating opposite ends of the spectrum in terms of severity. The objective of this paper is to enhance the reader's knowledge about a "common" problem and to increase the future appreciation for patients experiencing this alteration in bowel functioning.

Adult↗
PubMedDate not supplied

High risk genital papillomavirus infections are spread vertically.

It is well recognised that high-risk human papillomaviruses (HPVs) are spread by sexual activity, but the possibility of non-sexual transmission remains controversial. We present evidence for vertical transmission from at least 30% HPV positive mothers to their infants, resulting in persistent infection in children. That the mother is the source of infant infection has been confirmed by DNA sequencing. We also discuss the evidence for oral HPV-16 infection in children. In our own studies, HPV-16 DNA was detected in buccal cells from 48% children, aged 3-11 and transcriptionally active infection was confirmed in some children. Other studies have reported prevalences of 19%-27% among children less than 11 years of age. Studies that have failed to detect high-risk HPVs in children have used techniques which were insufficiently sensitive to detect the low levels of virus present. Serological studies also suggest that < or = 45% prepubertal children have acquired HPV-16. Thus, convincing evidence is now available for vertical transmission of high risk HPVs, which probably results in widespread infection among children. The consequences of such infections remain to be elucidated.

Antibodies, Viral↗