Table 3 Study eligibility criteria

(i) Provision of signed and dated informed consent form

(i) Current or prior use of immunosuppression in the previous six months

(ii) Stated willingness to comply with all study procedures and availability for the duration of the study

(ii) Treatment with an investigational drug or vaccine in previous six months

(iii) Male or female, aged 2–9 years

(iii) Any event or information deemed unsafe at the discretion of the principal investigator

(iv) Live within approximately 5.5 km of the Kampong Speu Referral hospital;

(v) In good general health evidenced by medical history

(vi) Willing to allow biological samples to be stored for future research