RIO DE JANEIRO, Brazil (AFP) — Shortages of Covid-19 vaccines have forced several large Brazilian cities to suspend administering second doses, officials and media reports said Monday, the latest breakdown in the hard-hit country’s troubled immunization drive. Seven of Brazil’s 26 state capitals have stopped administering the booster shot of Chinese-developed CoronaVac because of a lack of supply, according to news site G1. And Rio de Janeiro, Brazil’s second city, announced Saturday it was halting […]