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| group | s2 | flu |
| 0-19 | 99.997 | ? |
| 20-29 | 99.986 | ? |
| 30-39 | 99.969 | ? |
| 40-49 | 99.918 | ? |
| 50-59 | 99.730 | ? |
| 60-69 | 99.410 | ? |
| 70- | 97.600 | ? |
Face masks breed dangerous bacteria.
Most deaths in the 1918 “Spanish Flu” pandemic were caused by bacterial infection, not viral influenza.
Some Interesting Though Unsuccessful Attempts to Transmit Influenza Experimentally.
Public Health Reports 1919/01/10; 34(2):33–67. PMID: 19314651; PMCID: PMC1996903.
https://www.ncbi.nlm.nih.gov/pmc/issues/149539/
https://stacks.cdc.gov/view/cdc/67902
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In 1918 officers of the US Medical Corps, USNRF, and US Health Service made aggressive attempts to transmit influenza from sick people to healthy volunteers. Routes included swabs, sprays, subcutaneous injections, and having sick patients cough directly into the faces of volunteers. None of the 68 volunteers became infected.