Nigeria's Centre for Disease Control says 60 people evacuated from Ukraine have tested positive for coronavirus.
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The new cases pushed the number of new daily infections to 118, the agency said in its latest update.
These new cases were reported mainly in the capital, Abuja, and in Lagos.
Earlier Nigeria had reported only two new infections this week, the lowest daily figure ever since the outbreak reached here in 2020.
The World Health Organization had warned that the Russia-Ukraine war may result in undetected transmission of Covid-19.
More than 700 Nigerians have returned home from Ukraine as the government hopes to evacuate approximately 5,000 citizens.
Many of them reportedly crossed into Romania, Poland, Hungary and Slovakia from where they will be transported back to Nigeria.
