Biomedical subjects
N Deivanayagam
Publications and source records attributed to N Deivanayagam.
Etiological agents of acute poliomyelitis in south India.
This study was done to identify the specific etiological agents that cause acute poliomyelitis (APM). All the children newly diagnosed clinically as APM at the Institute of Child Health, Madras, during the period May 1988 to May 1989 were recruited. Stool specimen collection, transportation and identification of viruses by culture were done by standard procedures. The total number of children recruited was 312. Specimens were contaminated/insufficient in 10. Analysis was done for 302 cases. Polio virus type II was identified in 25.5% children, type I in 18.5%, type III in 15.9%, multiple polioviruses in 6.3% and non-polio enteroviruses (NPEV) in 20.2% cases. No virus was identified in 13.6%. Among the APM cases clinically diagnosed, the proportion of NPEV has increased considerably from 5% in 1984 to 20.2% in 1988-89. The age distribution was not significantly different between polio viruses and NPEV. The distribution of polio viruses and NPEV did not differ significantly in relation to immunization status, source of water supply, method of excreta disposal and the clinical types. For surveillance and control/eradication program of poliomyelitis, laboratory confirmation is essential.
Neonatal tetanus: observations on antenatal immunization, natal and immediate post-natal factors.
The objective is to study the present status of the antenatal immunization with tetanus toxoid and the natal and immediate postnatal factors among the cases of neonatal tetanus and the changes over time. Retrospective analysis of 61 case records of Neonatal Tetanus (NNT) during 1987-88 and prospective study of 19 cases of 1989 was done. The number of cases have decreased considerably from 88 in 1984 to 19 in 1989. 80% of cases were from residents outside the city. Antenatal checkup improved from 37.7% in 1987 to 73.7% in 1989. The proportion of mothers of NNT cases who received = greater than 2 doses have increased from 19.7% in 1987-88 to 31.6% in 1989. In the year 1989, 21% and 10.5% have received the I and II doses of TT respectively at the 9th month of pregnancy, the value of which is doubtful. Majority (73.7%) were domiciliary deliveries conducted by dhais and this has not changed over the years. The importance of antenatal booking, immunization at the appropriate time, hygienic obstetric and cord care are stressed.
Estimating the burden of illness in an Ontario community with untreated drinking water and sewage disposal problems.
The Hamilton-Wentworth regional health department was asked by one of its municipalities to determine whether the present water supply and sewage disposal methods used in a community without piped water and regional sewage disposal posed a threat to the health of its residents. Three approaches were used: assessments by public health inspectors of all households; bacteriological and chemical analyses of water samples; and completion of a specially designed questionnaire by residents in the target community and a control community. 89% of the 227 residences in the target community were found to have a drinking water supply that, according to the Ministry of Environment guidelines, was unsafe and/or unsatisfactory. According to on-site inspections, 32% of households had sewage disposal problems. Responses to the questionnaire revealed that the target community residents reported more symptoms associated with enteric infections due to the water supply. Two of these symptoms, diarrhea and stomach cramps, had a relative risk of 2.2 when compared to the control community (p less than 0.05). The study was successfully used by the municipality to argue for provincial funding of piped water.