Al Jazeera English reports: Two main Omicron mutations, known as B-point-four and B-point-five, are harder to track and resistant to vaccines. The next few months will see an increase in global travel, as millions take their summer holidays. That is likely to increase the spread of COVID-19. Those in the pandemic-hit tourism industry were hoping to recover this season, as restrictions began to ease in many places, but that could change. The head of the World Health Organization says the pandemic is not over.