Suspect Case
- Acute onset
- High fever of less than 7 days duration
- Severe headache
- Myalgia
- Severe Arthralgia
- With or without rash
- Suspect case of CHK
- High vector density
- Presence of confirmed case of CHK in the area
- Isolation of virus from blood in early phase
- Serological test for IgM antibody after 5th day of illness
- Demonstration of 4 fold or greater rise in IgG antibodies in paired sera
The disease affects all age groups.