RESUMEN
In Thailand, 40 000 subdistrict health centre (SDHC) personnel and >1 million village health volunteers (VHVs) are responsible for primary healthcare of 23 million households in 75 032 villages. They were trained, made household visits, gave hygiene advice, participated in the 'Big Cleaning Day' campaign, produced cloth face masks, proactively identified high-risk visitors and monitored quarantined cases. 7.4 million Thais received basic education on hygiene, 1.3 million villagers joined the campaign and 3.6 million handmade cloth face masks were produced. In March 2020, 3.9 million households were visited, and 40 000 high-risk cases were detected. The intensity of proactive case findings increased to 12.6 million home visits and 834 000 cases were detected in April 2020. Almost 800 000 cases complied with the 14-day mandatory home quarantine, of which 3.6% developed symptoms suspected of respiratory tract infection. VHVs and SDHC personnel could efficiently contribute to the prevention and control of COVID-19 in Thailand.