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South Africa
Brazil strikes 4,000 Covid deaths from a rampant virus every day
Covid-19 coronavirus mutants multiply as scientists race to decode variations
UK says AstraZeneca was shot safely even after 7 deaths from blood clots
105,000-year-old Kalahari crystals challenge the cultural evolution story
Variants are on the rise in some states, making pressure on the vaccine more urgent
Virus variants that have been found to be more deadly and contagious; some can work against vaccines
Astra Shot does not thwart the South African variant in study data
Covid-19 Vaccine-Induced Antibodies Less Effective Against Some Coronavirus Variants: Study
Africa appears to be rocky terrain for Russian and Chinese vaccines
Moderna is conducting trials with new booster shots against COVID-19 variants
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