Emergence of a New Covid Variant Across the US
A fresh strain of the Covid virus, identified as BA.3.2, is making its way across the United States, raising concern that current vaccines may not provide adequate protection against it.
The new strain has been identified in samples taken from four US travelers and in five patients across four different states. Evidence of the strain has also been found in wastewater samples collected from aircrafts and in over 20 states, indicating a wider reach than initially anticipated.
BA.3.2 is a descendant of the omicron variant, having first been identified in South Africa in the year following the emergence of BA.2.86, which later evolved into JN.1, the dominant strain that year. However, this newer strain is distinct from the JN.1 lineages that have been circulating in the United States since the start of the previous year.
The Implications of BA.3.2
This significant difference may necessitate updates to the current vaccines, which have been primarily designed to target JN.1's subvariants and offer protection against the prevalent US variants. BA.3.2 carries roughly 70 to 75 genetic alterations in its spike protein, which is the part of the virus that enables it to invade human cells. These changes facilitate the virus's spread and help it evade the body's immune defenses.
Lab studies have revealed that the BA.3.2 variant can evade the body's protective antibodies triggered by Covid vaccines, likely due to mutations in the spike protein. This highlights the urgent need for additional data on the effectiveness of vaccines against this new strain.
Despite these alarming findings, the full implications of this evasive variant remain largely unknown. BA.3.2 is not currently one of the dominant Covid variants in the US, and the cases reported so far have not been more severe than those caused by other strains.
Consequences of the New Variant
BA.3.2 has been detected in hospitalized patients in three different states during the last two months of the previous year and the first month of this year. These patients included two older adults with other health issues, one of whom was admitted for heart care, and a young child who received outpatient treatment. All patients survived, and researchers have been quick to clarify that the detection of this variant in hospitalized patients does not necessarily mean that it causes more severe disease or that it is associated with specific risk factors.
However, with Covid now considered endemic, it is expected that the virus will continue to mutate, and dozens of variants are currently circulating. While these may not vary significantly, scientists stress the need to adapt our response accordingly.
To slow down the mutation process, it's crucial to reduce the opportunities for the virus to replicate. This year, other respiratory illnesses such as the flu and RSV appear to have surpassed Covid during its typical winter surge. However, there will likely be another chance for increased cases in the summer, which has seen a rise in cases since the pandemic's onset in the US.
There is some positive news, though. The number of Covid deaths, positive tests, and emergency room visits for infections have all been declining since the previous year.