It announced 1 042 new cases of Covid-19 in the past 24 hours, compared to just around 20 two weeks ago.
After South Africa alerted the world to the new strain of Covid last week, dozens of countries imposed travel bans on southern Africa, including Zimbabwe.
South Africa led a chorus of criticism over the bans, but Zimbabwe’s President Emmerson Mnangagwa instead imposed his own restrictions.
On Tuesday, he required a 10-day quarantine for all arrivals in the country, extended a night-time curfew, and required proof of vaccination to visit bars or clubs.
But one case of Omicron was confirmed Thursday, and infections are soaring.
The country has limited health surveillance systems, and the huge jump in cases has alarmed authorities.