| Incidence | Prevalaence |
| Rate | Ratio |
| Only new cases | Old + new |
Prevalence = incidence X duration of illness
| Type of epidemic | Epdemic curve | Other imp points | Examples |
| Point source | Sharp raise and shar fall |
| Bhopal gas tragedy, food poisoning |
Soft tick: QRS : Q fever, relapsing fever , soft tick
Hard tick :tick typhus, viral encephalitis, viral hemorrhagic fever, KFD, Tularemia, tick paralysis, human babesiosis
Mites: itch mite: scabies
: trombiculid mite: scrub typhus, ricketsial pox
Typhus: epidemic typhus: louse
: endemic ( or ) murine typhus: rat flea
: scrub typhus: tromboculid mite
: tick typhus: hard tick
Louse: PTR: ePidemic Typhus , Trench fever, Relapsing fever
Relapsing fever: soft tick & louse
| Type of mosquito | Disease |
| Anopheles | Malaria, filaria ( not in India ) |
| Culex | Bancroftian filariasis, japanese encephalitis, West Nile fever, viral arthritis |
| Aedes | Yellow fever, dengue, chikungunya, rift valley fever, filaria |
| Mansonoides | Malayan( brugian ) filariasis, chikungunya |
Source: table 5 page no: 626 park 19th edition
