By Jennifer Rigby and Julie Steenhuysen LONDON (Reuters) – BA.5, part of the Omicron family, is the latest coronavirus variant to cause widespread waves of infection globally. According to the World Health Organization’s most recent report, it was behind 52% of cases sequenced in late June, up from 37% in one week. In the United States, it is estimated to be causing around 65% of infections. [W1N2YN01P] RISING CASE NUMBERS BA.5 is not new. First identified in January, it has been tracked by the WHO since April. It is a sister variant of the Omicron strain that has been dominant worldwide since…
