“We have at least 100 people minimum positive for Covid in base camp, and then the numbers might be something like 150 or 200.”
Also, SCMP:
A growing number of climbers are using oxygen-deprivation tents ahead of their adventures to reduce exposure to the virus by cutting down expedition lengths
...
Acclimatising at home could mean reducing an Everest trip from eight weeks to just four, but it comes with a hefty price tag.
Climbers can pay up to US$85,000 for their shortened trek and tent experience – almost double some estimated costs to scale Everest.