ASSESSMENT OF SEVERITY OF DISEASE CAUSED BY SCHISTOSOMA HAEMATOBIUM AND S MANSONI IN EGYPT-49 PROJECT AREA

Google Scholar
  • 1 January 1966
    • journal article
    • research article
    • Vol. 35  (3) , 389-+
Abstract
The impact of bilharziasis on a community has been evaluated in terms of the stages and grades of severity of the disease; egg counts in feces and urine were correlated with the clinical severity. At the time this study was carried out, the over-all prevalence of S. haematobium infection was 37.6%, that of S. mansoni infection 29.0% and that of mixed infections 17.1%. Of 579 people examined, 292 (58.2%) were excreting schistosome eggs. All except one person were classified as Stage III[long dash]asymptomatic, 122 (41.8% of those infected); mild,74 (25.3%); moderate, 89 (30.5%); severe, 6 (2.1%). The remaining person was classified as State IV (moderate). Mixed Infections produced a higher proportion of symptomatic cases (74.8%) than either infection alone (58.2%), and S. haematobium (57.1%) a higher proportion than S. mansoni (37.8%), The percentage of symptomatic cases was highest in those aged 10-14 years, who also had the height prevalence of infection. On average, the egg output per infection was in the range 32-63 eggs for S. haematobium infections and 4-7 for S. manosoni in unit measure of urine and feces, respectively. For S. haematobium infections, alone and in mixed infections, mean egg output increased with the severity of clinical symptoms. For S. mansoni infections, no such relation was established. It is concluded that the criteria of severity should be made more objective and that more satisfactory methods of determining egg counts should be adopted in an attempt to obtain more direct evidence of the validity of regarding egg count as a measure of worm load.