A new Covid variant dubbed “Pirola” is sweeping the United States and is currently being closely monitored by the World Health Organisation.
“Pirola” is a combination of the Greek letters Pi and Rho, has more than 30 mutations to its spike protein compared to XBB.1.5, a variant of Omicron that had been the dominant strain in the US, according to a Thursday bulletin in Yale Medicine.
“Such a high number of mutations is notable,” said Yale Medicine infectious diseases specialist Scott Roberts, MD.
Dr Roberts said that this was similar to the number of mutations that differed between Delta, one of the early strains of the coronavirus, and Omicron.
“When Omicron hit in the winter of 2021, there was a huge rise in COVID-19 cases because it was so different from the Delta variant, and it evaded immunity from both natural infection and vaccination,” Dr Roberts added.
“The other concern is that this strain has been picked up in at least six countries, and the cases are unrelated. This suggests some degree of transmission in the [international] community that we’re not detecting.”
What is BA.2.86?
Maria Van Kerkhove, an epidemiologist and lead for the Covid response at the WHO, said very limited information was available on the newly discovered strain. But a large number of mutations within it needed closer monitoring, she wrote on Twitter.
“Surveillance, sequencing and Covid-19 reporting [are] critical to track known and detect new variants,” she added.
The variant, also referred to as BA.X, was found through genetic sequencing – a process where scientists determine the building blocks of a molecule’s DNA.
Scientists are on alert due to the overly high number of mutations of the variant, with more than 30 in the spike protein – the part of the virus that vaccines aim to neutralise.
How many cases are there in the US?
According to the Centers for Disease and Control Prevention, as of 23 August, there were two cases of BA.2.86 detected in the US.
One of the cases is in a person detected through the CDC’s Traveler-based Genomic Surveillance and the “identification of these cases in multiple geographies is evidence of international transmission,” the CDC reported.
However, the CDC noted that the current hospitalisations in the country are not “likely” driven by BA.2.86, but added, “this assessment may change as additional data become available.”
Globally, the variant has been detected in Denmark, South Africa, Israel, the United Kingdom and the US.
What can you do to protect yourself?
The CDC has advised people to protect themselves from the virus as it is not yet clear “how well this variant spreads,” however as a precautionary measure people have been asked to do the following:
• Get your Covid-19 vaccines.
• Get tested for Covid.
• Seek treatment if you have Covid-19 and are at high risk of getting very sick
• If you choose to wear a mask, wear a high-quality one that fits well over your nose and mouth Improve ventilation.
•Wash your hands.
What are the symptoms?
Symptoms of the new variant include a runny nose, headache, fatigue, sneezing and a sore throat.
What are the experts saying?
Kristian G Andersen, an immunologist and infectious diseases expert, said the lineage had all the hallmarks of something that could take off, but added: “Our immunity landscape is now complex, so it’s too early to say it will.”
Dr S. Wesley Long, medical director of diagnostic microbiology at Houston Methodist, a flagship Texan hospital, said it remained to be seen whether BA.2.86 would be able to out-compete other strains of the virus or have any advantage in escaping immune responses from prior infection or vaccination.
