Influenza in Sweden – Season 2018–2019

The 2018–2019 season in Sweden was dominated by influenza A and reached a moderate level of intensity. According to several surveillance systems, the season was less intense than the five previous seasons. The epidemic started in the second week of December (week 50) and reached its peak in mid-February (week 6). The laboratories in Sweden reported 13,757 influenza cases during the season, which was fewer cases than in the previous season. Ninety-nine percent of these were influenza A. Influenza A(H1N1)pdm09 dominated until week 10, when dominance shifted to influenza A(H3N2). The distribution within subtyped laboratory samples was 63 percent A(H1N1)pdm09 and 37 percent A(H3N2).