2017 annual influenza season: rainy season; during 1st May to 31st October, 2017

Non-influenza season: winter; November 1, 2017 to April 30, 2018.

2018 annual influenza seasons: rainy season; during 1st May to 31st October, 2018

Table 3. Association of clinical respiratory illness with ST-elevation myocardial infarction by study seasons