Which one of the following is a disease for which India has not faced epidemic at any point of time in the past?

An epidemic is defined as the rapid spread of an infectious disease to a large number of people in a given population within a short period of time. Leukaemia is a type of blood cancer, which is a non-communicable disease (NCD). Since it is caused by genetic mutations and environmental factors rather than pathogens like bacteria or viruses, it cannot be transmitted from person to person and therefore cannot cause an epidemic.

• Cholera: India has a long history of cholera epidemics, particularly originating from the Bengal region in the 19^th and 20^th centuries.
• Plague: India suffered devastating plague outbreaks, most notably the 1896 Bombay plague and the 1994 Surat outbreak.
• Swine flu (H1N1): India faced a major epidemic/pandemic of H1N1 in 2009-2010, with several seasonal outbreaks occurring since then.