A man moves around offering fumigation services in a poor neighborhood to curb the spread of COVID-19 in Harare, Zimbabwe, Monday, Nov, 29, 2021. The emergence of the new omicron variant and the world’s desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines. (AP Photo/Tsvangirayi Mukwazhi)