Index case refer to:-
First case of a communicable disease introduced into the population unit, being studied Primary case First case to come to attention of investigator Index case Developing from contact with primary case Secondary case An individual who has signs and symptoms connected to the suspected pathogens Suspect case
First case of disease in community
All cases that occurs after primary case
First case which comes into notice of investigator and usually it is secondary case
None of above
Other Key Definitions & Concepts