FILE- In this March 19, 2021, file photo, a Nepalese health worker collects a nasal swab sample of Bahraini prince Mohamed Hamad Mohamed al-Khalifa to test for COVID-19 before he heads for an expedition to Mount Everest in Kathmandu, Nepal. A year after Mount Everest was closed to climbers as the pandemic swept across the globe, hundreds are making the final push to the summit with only a few more days left in the season, saying they are undeterred by a coronavirus outbreak in base camp. (AP Photo/Niranjan Shrestha, File)