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Clinical observations on smallpox: a study of 1233 patients admitted to the Infectious Diseases Hospital, Calcutta,
Abstract:
The paper presents clinical observations on 1 233 persons with smallpox who were admitted to the Infectious Diseases Hospital, Calcutta, in 1973. The disease was of the modified type in 53 patients (4.3%), the ordinary type in 717 (58.2%), the flat type in 249 (20.2%), and the haemorrhagic type in 214 (17.3%). The fatality of these types of smallpox was found to be 5.7%, 26.8%, 88.4%, and 98.1%, respectively, and the overall case fatality was 50.7%. The haemorrhagic type was found mainly among older patients and affected males more often than females. The vaccination status of 1 218 patients was known. Of these, 901 (73.9%) were unvaccinated and had a fatality rate of 53.4%, whereas the 317 (26.1%) vaccinated patients had a fatality rate of 36.5%. Among the 201 haemorrhagic cases, 145 patients were unvaccinated (16.09% of the total number unvaccinated) and 56 (17.67%) had been vaccinated. Of 34 patients vaccinated during the incubation period, 19 (41.1%) died, whereas of 18 patients who had been vaccinated after the onset of fever, but before the appearance of rash, 9 (50%) died.
Insights
Clinical observations of 1,233 smallpox patients in Calcutta revealed varied disease types and high fatality rates. Vaccinated individuals showed a lower fatality rate, highlighting the importance of vaccination in smallpox management.
Area of Science:
- Epidemiology
- Infectious Diseases
- Public Health
Background:
- Smallpox (Variola virus) historically caused significant mortality and morbidity worldwide.
- Understanding clinical presentations and risk factors is crucial for disease control.
Purpose of the Study:
- To analyze clinical observations of smallpox cases admitted to a hospital in Calcutta in 1973.
- To determine the fatality rates associated with different smallpox types and vaccination status.
Main Methods:
- Retrospective analysis of clinical data from 1,233 smallpox patients.
- Categorization of cases into modified, ordinary, flat, and hemorrhagic types.
- Assessment of case fatality rates based on disease type and vaccination history.
Main Results:
- Overall case fatality rate was 50.7%.
- Hemorrhagic smallpox had the highest fatality (98.1%), followed by flat (88.4%), ordinary (26.8%), and modified (5.7%) types.
- Vaccinated patients had a lower fatality rate (36.5%) compared to unvaccinated patients (53.4%).
- Hemorrhagic type predominantly affected older males.
Conclusions:
- Smallpox clinical types significantly influence fatality, with hemorrhagic and flat types being most severe.
- Vaccination status is a critical determinant of survival, with vaccinated individuals exhibiting better outcomes.
- Timely vaccination, even during the incubation period, may offer some protection but does not guarantee survival.