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Growing concern that Covid-19 vaccines being deployed across much of the developing world aren’t capable of thwarting the delta variant is prompting some countries to look at offering third doses to bolster immunity against more-infectious virus strains. Though definitive evidence is yet to emerge backing the need for so-called “booster” shots, health officials from Thailand to Bahrain and the United Arab Emirates have already decided to offer the extra doses to some people already inoculated with vaccines from Chinese makers Sinovac Biotech Ltd., Sinopharm and from AstraZeneca Plc. Officials are being motivated by concerns that delta and other variants appear to be breaking down defenses of vaccines not made from the super-effective messenger RNA technology, or mRNA. In places like Mongolia and the U.A.E., high levels of coverage with Chinese shots using the older, less effective inactivated vaccine platform hasn’t stopped a surge in cases. In the Seychelles, five peopl

United arab emiratesThe seychellesShane crottyShao yimingSoumya swaminathanAlbert bourlaNikolai petrovskyUs centers for diseaseIndonesian doctors associationWorld health organizationDrug administrationChinese centerAstrazeneca plcPfizer incSinovac biotech ltdModerna inc