自從確診人數有趨緩之後，人們在防疫的行為上就有所鬆懈，僅而導致了確診數

自從確診人數有趨緩之後，人們在防疫的行為上就有所鬆懈，僅而導致了確診數量驟增。

結果 (英文) 1:

Since the number of confirmed diagnoses has slowed down, people have slackened their anti-epidemic behavior, which has only led to a sharp increase in the number of confirmed diagnoses.

結果 (英文) 2:

Since the number of confirmed cases has slowed down, people have been lax in the prevention of epidemic, which only led to the rapid increase of the number of confirmed cases.

結果 (英文) 3:

Since the 診 of people had 趨緩, people have been relaxed in their efforts to prevent the epidemic, resulting in an increase in the number of 診 驟.