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Graph of herd immunity threshold vs basic reproduction number with selected diseases. S will be (1 − q), since q is the proportion of the population that is immune and q + S must equal one (since in this simplified model, everyone is either susceptible or immune). Then:
Respiratory illness activity – a measure of how often conditions like the common cold, flu, COVID-19, and respiratory syncytial virus are diagnosed – is currently "high" in the United States ...
A study of samples collected in Manaus between November 2020 and January 2021, indicated that the Gamma variant is 1.4–2.2 times more transmissible and was shown to be capable of evading 25–61% of inherited immunity from previous coronavirus diseases, leading to the possibility of reinfection after recovery from an earlier COVID-19 ...
US influenza statistics by flu season. From the Centers for Disease Control and Prevention page called "Disease Burden of Flu": "Each year CDC estimates the burden of influenza in the U.S. CDC uses modeling to estimate the number of flu illnesses, medical visits, hospitalizations, and deaths related to flu that occurred in a given season.
The most recent surveillance data from the CDC shows minimal to moderate flu activity in most of the U.S. Some parts of the country, including Oregon and Louisiana, show very high activity, however.
This year's flu shot, similarly, seems to be a good match for circulating strains: It reduced the risk of flu hospitalizations by 52% in the Southern Hemisphere, according to a CDC report.
From survey data CDC estimated that 51.8% of persons six months and older were vaccinated during the 2019–20 flu season, an increase of 2.6 percentage points from the prior season. [5] FDA's Vaccines and Related Biological Products Advisory Committee selected the following strains for the vaccine: [ 6 ]
The latest numbers show 66 confirmed human cases of bird flu in the U.S. The CDC is taking a holiday break and will resume updates on human cases on Jan. 3. The CDC is taking a holiday break and ...