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They noted the presence of residual virus in tissues after infection, cross-reactivity between specific antibodies against the coronavirus and host proteins, leading to autoimmune reactions and other possibilities. However, these hypotheses still need further verification.

An aerosolized COVID-19 vaccine has emerged as a promising field of research due to its easy accessibility and unique way of stimulating protection.

Karaoke bars in Shanghai have been ordered to close following a spike in new COVID-19 infections linked to such venues, local authorities announced on Wednesday.

China cannot accept the current version of the second phase investigation into the origins of the COVID-19 virus launched by the World Health Organization, for the plan has been compromised by political manipulation and disrespect of scientific facts, Zeng Yixin, deputy head of the National Health Commission, said at a news briefing on Thursday. 

"We have to strengthen the need for cooperation. This is the time to strengthen multilateralism in order to join efforts and to face together a threat to the whole mankind," Borrel said.