Mass Gathering and Population Movement in India: Possible Risk of Vector-Borne Diseases

Surveillance tools measure and help to predict the possibility of the onset of any disease including vector-borne diseases during some specific situations likemass gatherings (MGs) that are closely related tothe disease epidemiology (why, what, who, where, when, and how)concerningthe transmission of infectious diseases including vector-borne diseases. Some situations ofmass gatherings may bring closely large and diverse population groups coming from different endemic zones/areas leading tothe transmission of communicable diseases including vector-borne diseases. Mass gatherings (MGs) may have the potential to enhance the transmission dynamics of vector-borne diseasesowing to different geographical, social, and climatic factors. Usually, MGs have been thought to have enhanced risks of disease transmission.Theyalso have the potential to increase the opportunities for other types of mechanical injuriesfrom accidents, stampedes, alcohol use, internal group fights etc. that may result in morbidity or mortality.Besides, they are potential breeding places for the proliferation of vector species, capable of transmitting malaria, dengue, chikungunya, and JE including ticks and mites-borne diseases. It is a well-known fact there area large number of asymptomatic cases which act as sub-clinical cases, hence, chances of local transmission through vectors during such mass gatherings can not be ruled out.There is always a need for well-structured, intensified real-time disease and vector surveillance and reporting systems in place which is essential for efficient MG planning, to ensure disease prevention and control. In the present context of the ongoing COVIDpandemic, such surveillance systems havebecome a vital component of such events of mass gatherings and large-scale movement of people.