<s>[INST] How many influenza cases were there in the USA in the year 2020-2021? [/INST] During the 2020-2021 flu season, there was very low circulation of seasonal flu viruses. From September 27, 2020–May 22, 2021 in the United States, only 0.2% of clinical samples tested were positive for an influenza virus1. Is there anything else you would like to know?</s>\ <s>[INST] 0.2% seems pretty low. In reality, can we claim that this rate is higher considering that there are people who do not go to the hospital even though they are sick? [/INST] Yes, it is possible that the actual number of cases is higher than reported. However, CDC's influenza surveillance system is designed to track influenza activity in the United States and provides a more accurate picture of influenza activity in the country.</s>