Table 1 Case classification in Thailand

A

Indigenous case, a patient who contracted malaria in the village where the patient lived during infection period

B

Imported case, a patient who contracted malaria from another area. Place of infection must be identified at village level

 Bx

Contracted malaria from another village but within the same subdistrict

 By

Contracted malaria from another subdistrict but within the same district

 Bz

Contracted malaria from another district but within the same province

 Bo

Contracted malaria from another province

 Bf

Contracted malaria from abroad

C

Relapse case, a Plasmodium vivax or Plasmodium ovale patient who had a malaria episode and has recurrent fever that is not a new infection

D

Induced case, a patient who received malaria parasites from blood transfusion

E

Introduced case, a patient who contracted malaria with evidence connecting the case to an imported case

F

Unclassified case where, after investigation, staff are unable to determine a whether the patient is A or B

G

Uninvestigated case, a patient that staff unsuccessfully attempted to investigate