MELBOURNE (Reuters) – Thousands of Australian students return to school on Monday after a summer break, as the country remains anxious about the spread of COVID-19, which on Sunday killed at least 88 people in the country. Although some schools reopened last week, most will do so on Monday, many requiring students to be tested twice a week. Fuelled by the fast-spreading Omicron variant, infections have exploded in Australia since December, the beginning of summer in southern hemisphere. There have now been 2 million COVID-19 cases there; up until December, Australia, a country of 25 million pe…