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story.lead_photo.caption A market bustles Thursday in Lagos, Nigeria, as African officials investigate the discovery of a new variant of the coronavirus in that country. More photos at arkansasonline.com/1225nigerians/. (AP/Sunday Alamba)

NAIROBI, Kenya -- Another new variant of the coronavirus appears to have emerged in Nigeria, Africa's top public health official said Thursday, but he added that further investigation is needed.

The discovery stands to add to new alarm in the pandemic after similar variants were announced in Britain and South Africa, leading to the swift return of international travel restrictions and other measures during a major holiday season.

"It's a separate lineage from the U.K. and South Africa," the head of the Africa Centers for Disease Control and Prevention, John Nkengasong, told reporters. He said the Nigeria CDC and the African Center of Excellence for Genomics of Infectious Diseases will analyze more samples.

"Give us some time, ... it's still very early," he said.

[CORONAVIRUS: Click here for our complete coverage » arkansasonline.com/coronavirus]

The identification of the apparent new variant was based on two or three genetic sequences, Nkengasong said, but that and South Africa's alert last week were enough to prompt an emergency meeting of the Africa CDC this week.

The variant in Nigeria, Africa's most populous country, was found in two patient samples collected Aug. 3 and Oct. 9 in Osun state, according to a working research paper seen by The Associated Press.

Unlike the variant seen in the U.K., "we haven't observed such rapid rise of the lineage in Nigeria and do not have evidence to indicate that the P681H variant is contributing to increased transmission of the virus in Nigeria. However, the relative difference in scale of genomic surveillance in Nigeria vs. the U.K. may imply a reduced power to detect such changes," the paper says.

The news comes as infections surge again in parts of the African continent.

The new virus variant in South Africa is now the predominant one there, Nkengasong said, as confirmed infections in the country approach 1 million. While the variant transmits quickly and viral loads are higher, it is not yet clear whether it leads to a more severe disease, he said.

Gallery: Nigerians battle coronavirus

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"We believe this mutation will not have an effect" on the deployment of covid-19 vaccines to the continent, he said of the South Africa variant.

South Africa's health minister has announced an "alarming rate of spread" in the country, with more than 14,000 new confirmed cases and more than 400 deaths reported Wednesday. It was the largest single-day increase in cases.

Covid-19 is "unrelenting," Health Minister Zwelini Mkhize said.

"There's no sign at the moment that we're reaching a peak. There's still rapid exponential growth," infectious disease specialist Richard Lessells said. South Africa needs to double down on virus control efforts "because already many hospitals in many parts of the country are extremely stretched," he said.

But there is little sign of the tough restrictions that many African countries imposed early in the pandemic, which were seen as causing severe pain to economies and millions of informal workers.

The African continent now has more than 2.5 million confirmed cases, or 3.3% of global cases. Infections across the continent have risen 10.9% over the past four weeks, the Africa CDC director said, including a 52% increase in Nigeria and a 40% increase in South Africa.

For the first time since confirming sub-Saharan Africa's first virus case in February, Nigeria is in the spotlight as infections surge.

"Over recent weeks, we've had a huge increase in number of samples to (Nigeria CDC) reference lab," CDC Director-General Chikwe Ihekweazu tweeted Thursday. "This has led to an unusual delay with testing, but we're working around the clock," with many colleagues cutting short their holidays and returning to work.

Nigeria now has almost 81,000 confirmed coronavirus cases. It saw a record number of daily cases Dec. 17 with more than 1,100, and there has been a "rapid increase" in infections in the past two weeks, the Nigeria CDC said this week, citing increased travel and "minimal compliance with COVID-19 safety measures" as reasons.

The government has again imposed some virus restrictions, including limits on gatherings, and recommended closings of bars, nightclubs and similar venues.

​​​​​Information for this article was contributed by Sam Olukoya and Mogomotsi Magome of The Associated Press.

A woman wearing a face mask to protect against coronavirus, walks at a market in Lagos, Nigeria, Thursday Dec. 24, 2020. Africa’s top public health official says another new variant of the coronavirus appears to have emerged in Nigeria, but further investigation is needed. The discovery could add to new alarm in the pandemic after similar variants were announced in recent days in Britain and South Africa and sparked the swift return of travel restrictions. (AP Photo/Sunday Alamba)
A woman wearing a face mask to protect against coronavirus, walks at a market in Lagos, Nigeria, Thursday Dec. 24, 2020. Africa’s top public health official says another new variant of the coronavirus appears to have emerged in Nigeria, but further investigation is needed. The discovery could add to new alarm in the pandemic after similar variants were announced in recent days in Britain and South Africa and sparked the swift return of travel restrictions. (AP Photo/Sunday Alamba)
A man pushes a wheelbarrow, at a market in Lagos, Nigeria, Thursday Dec. 24, 2020. Africa’s top public health official says another new variant of the coronavirus appears to have emerged in Nigeria, but further investigation is needed. The discovery could add to new alarm in the pandemic after similar variants were announced in recent days in Britain and South Africa and sparked the swift return of travel restrictions. (AP Photo/Sunday Alamba)
A man pushes a wheelbarrow, at a market in Lagos, Nigeria, Thursday Dec. 24, 2020. Africa’s top public health official says another new variant of the coronavirus appears to have emerged in Nigeria, but further investigation is needed. The discovery could add to new alarm in the pandemic after similar variants were announced in recent days in Britain and South Africa and sparked the swift return of travel restrictions. (AP Photo/Sunday Alamba)
Men ride a bike, at a market in Lagos, Nigeria, Thursday Dec. 24, 2020. Africa’s top public health official says another new variant of the coronavirus appears to have emerged in Nigeria, but further investigation is needed. The discovery could add to new alarm in the pandemic after similar variants were announced in recent days in Britain and South Africa and sparked the swift return of travel restrictions. (AP Photo/Sunday Alamba)
Men ride a bike, at a market in Lagos, Nigeria, Thursday Dec. 24, 2020. Africa’s top public health official says another new variant of the coronavirus appears to have emerged in Nigeria, but further investigation is needed. The discovery could add to new alarm in the pandemic after similar variants were announced in recent days in Britain and South Africa and sparked the swift return of travel restrictions. (AP Photo/Sunday Alamba)
People buy vegetables, at a market in Lagos, Nigeria, Thursday Dec. 24, 2020. Africa’s top public health official says another new variant of the coronavirus appears to have emerged in Nigeria, but further investigation is needed. The discovery could add to new alarm in the pandemic after similar variants were announced in recent days in Britain and South Africa and sparked the swift return of travel restrictions. (AP Photo/Sunday Alamba)
People buy vegetables, at a market in Lagos, Nigeria, Thursday Dec. 24, 2020. Africa’s top public health official says another new variant of the coronavirus appears to have emerged in Nigeria, but further investigation is needed. The discovery could add to new alarm in the pandemic after similar variants were announced in recent days in Britain and South Africa and sparked the swift return of travel restrictions. (AP Photo/Sunday Alamba)
A woman wearing a face mask to protect against coronavirus, walks past people selling food at a market in Lagos, Nigeria, Thursday Dec. 24, 2020. Africa’s top public health official says another new variant of the coronavirus appears to have emerged in Nigeria, but further investigation is needed. The discovery could add to new alarm in the pandemic after similar variants were announced in recent days in Britain and South Africa and sparked the swift return of travel restrictions. (AP Photo/Sunday Alamba)
A woman wearing a face mask to protect against coronavirus, walks past people selling food at a market in Lagos, Nigeria, Thursday Dec. 24, 2020. Africa’s top public health official says another new variant of the coronavirus appears to have emerged in Nigeria, but further investigation is needed. The discovery could add to new alarm in the pandemic after similar variants were announced in recent days in Britain and South Africa and sparked the swift return of travel restrictions. (AP Photo/Sunday Alamba)
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