1. Coronavirus Caseswww.worldometers.info/coronoavirus
2. Over 40,000 Vaccinated People Test Positive in Kerala, India: Sources. Media Reporthttps://www.ndtv.com/india-news/over-40-000-breakthrough-infections-or-covid-cases-in-vaccinated-people-in-kerala-source-2507884
3. Kerala Reports over 40,000 Breakthrough Covid Cases, Raises Concerns of New Varianthttps://www.indiatoday.in/coronavirus-outbreak/story/kerala-reports-40000-breakthrough-covid-cases-new-variant-1839476-2021-08-11
4. Israeli Doctors Find Severe COVID-19 Breakthrough Cases Moslt in Older, Sicker Patientshttps://www.reuters.com/world/middle-east/israeli-doctors-find-severe-covid-19-breakthrough-cases-mostly-older-sicker-2021-08-20/
5. Israel’s COVID-19 Vaccine Breakthrough Cases Exceeded 50%https://www.precisionvaccinations.com/2021/08/11/israels-covid-19-vaccine-breakthrough-cases-exceed-50