The Czech Republic detected 2,521 new cases of COVID-19 on October 18, the highest daily tally since late April, data from the Health Ministry showed on Tuesday.
The Czech government has opted not to tighten anti-epidemic measures, focusing on vaccination instead as data show that most of those infected have not been inoculated.
6.03 million people have been vaccinated as of Monday.
The daily count reported for Monday is almost double the reported number for the same day last week.
Hospitalizations rose to 544, the highest number since the end of May, but still a fraction of the numbers in March, when the last wave of the pandemic swept over the country.
Over the past seven days, 54 people died in connection with COVID-19, more than in the whole month of September.
The country now has over 100 new cases per 100,000 inhabitants.
The health authorities have urged people who are as yet unvaccinated to consider getting the jab and have shorted the term for Covid booster shots from eight to six months after primary inoculation on the recommendation of the European drug regulator EMA.