Projection of HIV infection in Calcutta

Area of Science:

• Epidemiology
• Public Health
• Statistical Modeling

Background:

• Calcutta faces a growing human immunodeficiency virus (HIV) epidemic.
• Accurate projections are crucial for effective public health interventions.

Purpose of the Study:

• To provide the first-ever HIV infection projections for Calcutta from 1992-1999.
• To forecast HIV spread in the general and high-risk populations.
• To develop a novel statistical methodology for HIV projection.

Main Methods:

• Developed a statistical methodology incorporating social interactions and practices.
• Utilized survey and census data for demographic parameters and transmission rates.
• Generated two projection sets: a worst-case scenario and a data-consistent scenario.

Main Results:

• Total projected HIV cases in Calcutta for 1999 range from 49,000 to 126,000.
• Sex workers are projected to have the highest number of new infections.
• The general population shows a faster projected rate of prevalence increase, despite lower overall prevalence.

Conclusions:

• HIV infection poses a significant threat to Calcutta's population.
• Targeted interventions for high-risk groups, especially sex workers, are essential.
• The rapid increase in the general population warrants urgent public health attention.