Triple-vaccinated tourists from select countries can enter as part of small group tours
coronavirus1 day ago
The Japanese health ministry on Monday reported the country's first case of coronavirus variant XE, in a woman who arrived at a Narita airport from the United States on March 26.
The World Health Organisation said on Monday it is tracking a few dozen cases of two new sub-variants of the highly transmissible Omicron strain of the coronavirus to assess whether they are more infectious or dangerous.
It has added BA.4 and BA.5, sister variants of the original BA.1 Omicron variant, to its list for monitoring. It is already tracking BA.1 and BA.2 - now globally dominant - as well as BA.1.1 and BA.3.
The WHO said it had begun tracking them because of their "additional mutations that need to be further studied to understand their impact on immune escape potential".
Viruses mutate all the time but only some mutations affect their ability to spread or evade prior immunity from vaccination or infection, or the severity of disease they cause.
Only a few dozen cases of BA.4 and BA.5 have been reported to the global GISAID database, according to WHO.
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