Why are we not seeing signs of Herd Immunity in spite of COVID-19 Vaccination? Global Update on Vaccination rates and waning Immunity.
00:00 COVID-19 Case numbers rising
00:18 How well are the COVID-19 Vaccines working?
00:36 Global COVID-19 Update
00:50 Global Vaccination rates
01:08 Reproductive Number of SARS-CoV-2
01:36 Delta compared to other viruses
01:47 Why are COVID-19 cases rising in spite of vaccination?
02:13 Types of Immunity
02:51 Humoral versus Cellular Immunity
04:16 Susceptibility of Populations to COVID-19
References:
Immunogenicity of standard and extended dosing intervals of BNT162b2 mRNA vaccine: https://www.sciencedirect.com/science/article/pii/S0092867421012216
Boosting immunity to COVID-19 vaccines: https://www.nature.com/articles/s41591-021-01560-x
COVID-19 vaccination in Canada: https://health-infobase.canada.ca/covid-19/vaccination-coverage/
The reproductive number of the Delta variant of SARS-CoV-2 is far higher compared to the ancestral SARS-CoV-2 virus: https://academic.oup.com/jtm/article/28/7/taab124/6346388
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