| | European Union countries introducing their own COVID vaccination certificates would have to grapple with a myriad of disjointed systems if the bloc fails to build a shared one, a senior official said on Wednesday. | | | The following is a roundup of some of the latest scientific studies on the novel coronavirus and efforts to find treatments and vaccines for COVID-19, the illness caused by the virus. | | | Argentina's government said on Wednesday that it had met with representatives of drugmaker AstraZeneca Plc (AZN.L) to ask about "difficulties" in the production of its COVID-19 vaccine and supply of it to the country. | | | The United States has administered 234,639,414 doses of COVID-19 vaccines in the country as of Wednesday morning and distributed 301,857,885 doses, the U.S. Centers for Disease Control and Prevention said on Wednesday. | | | Mexican Foreign Minister Marcelo Ebrard on Wednesday played down delays in shipments of Russia's Sputnik V vaccine during a trip to Moscow where he worked out a deal to produce the shot domestically to speed up its rollout. | | | Indians struggled to register online for a mass vaccination drive set to begin at the weekend as the country's toll from the coronavirus surged past 200,000 on Wednesday, worsened by shortages of hospital beds and medical oxygen. | | | Pakistan recorded more than two hundred COVID-19 deaths in a day for the first time since the start of the pandemic on Tuesday, as the government said it was considering stricter lockdowns. | | | AstraZeneca PLC's (AZN.L) COVID-19 vaccine is safe and Canadians should have confidence in it, Prime Minister Justin Trudeau said on Wednesday, reacting to news that a woman had died of a rare blood clot after being inoculated. | | | U.S. President Joe Biden's top trade adviser met virtually with Microsoft co-founder and philanthropist Bill Gates on Tuesday about increasing COVID-19 vaccine production and the proposed waiver of intellectual property rights protections for vaccines. | | | European Union lawyers on Wednesday demanded AstraZeneca (AZN.L) immediately deliver COVID-19 vaccines from its factories in Britain, in a move that risks reigniting a spat with London over scarce vaccine supplies. | | | | |