Funding for this research was provided by:
Wellcome Trust (098511/Z/12/Z)
Received: 28 September 2018
Accepted: 4 June 2019
First Online: 17 June 2019
: The collaboration between the investigators (authors) and Ca Mau sub-Department of Livestock Production and Animal Health (CM-LPAH) was approved by The Hospital for Tropical Diseases in Ho Chi Minh City, Vietnam. The CM-LPAH specifically approved this study; at the province-level in Vietnam, CM-LPAH is the equivalent of an Animal Care and Use Committee that approves studies involving biological sampling from animals. Consent to participate was obtained orally from all participants, with the approval of the CM-LPAH.
: Not applicable.
: The authors declare they have no competing interest.