Read our Privacy noticeWhile overall respiratory illness activity remains very low across the U.S., there are signs of another summer Covid spike. While most states have a very low level of activity, four are seeing moderate to high activity and nearly all states are seeing growing cases, according to the agency. California, Kentucky and Hawaii are reporting moderate levels in wastewater data and Alaska is seeing high activity. open image in gallery Covid vaccines can reduce the risk of serious illness from Covid infections ( AFP/Getty )Although, the Covid pattern is likely more variable than the traditional flu. Covid vaccines can reduce the risk of serious illness and past research has shown they helped save millions of lives.