As COVID-19 continues to mutate not just in India but globally, Maharashtra sees a rise in infections with a dominant COVID XFG variant, a newly dominant Omicron sub-lineage, as revealed by recent genome study. A comprehensive analysis of 184 samples across 10 districts has confirmed that XFG now accounts for the majority of cases in the region, signaling a shift in the viral landscape and highlighting the continued importance of genomic vigilance.As on 20 June 2025, the COVID-19 active cases has dropped to 5976 from an almost 7000 tally.While the world adapts to a “living with COVID” strategy, the virus itself shows no signs of standing still. The rise of XFG, along with the emergence of multiple other sub-lineages such as LF.7.9, JN.1, and NB.1.8.1, underscores how the SARS-CoV-2 virus remains a moving target—one that scientists and public health officials must continue to track closely.Genome Study Flags XFG as Dominant Variant in MaharashtraThe state’s genome sequencing efforts—led by BJ Medical College (BJMC), Pune, and National Institute of Virology (NIV), Pune—have found XFG in 84 out of 184 samples, making it the most dominant variant in the latest sequencing batch. Mumbai alone accounted for nine cases of XFG, while three were identified as LF.7.9, another emerging subvariant.Dr. Rajesh Karyakarte, genome sequencing coordinator for Maharashtra, told TOI, “After NB.1.8.1 was identified in Hong Kong as a possible surge-driving variant, we intensified our sequencing protocols. Interestingly, while NB.1.8.1 did appear in Pune, the highest frequency was noted for XFG and LF.7.9, indicating localized adaptation.”The presence of 38 unassigned lineages in the sequencing results also indicates the continual mutation and evolution of SARS-CoV-2 in real time.What is the XFG Variant?The XFG variant is what virologists call a “recombinant” subvariant, a strain born from the combination of two previous Omicron derivatives: LF.7 and LP.8.1.2. This recombination process occurs when a person is simultaneously infected with both parent variants, allowing the virus to mix and rearrange genetic material to form a new hybrid.So far, the Indian SARS-CoV-2 Genomics Consortium (INSACOG) has reported 163 XFG cases across the country, with the majority emerging from Maharashtra, followed by Tamil Nadu, Kerala, Gujarat, Andhra Pradesh, Madhya Pradesh, and West Bengal.XFG is not currently classified as a Variant of Concern (VOC) or Variant of Interest (VOI) by the World Health Organization (WHO) or India’s Ministry of Health. However, experts are monitoring it closely because of its notable immune evasiveness.Is XFG a 'Variant of Concern'?According to early lab data and real-world sequencing observations, XFG carries mutations that allow it to bypass existing immune responses, even among vaccinated or previously infected individuals. This characteristic is known as “immune escape,” and it allows the virus to persist longer within hosts and spread more readily within communities.However, the receptor binding efficiency of XFG that is, how well it binds to ACE2 receptors in human cells—is believed to be moderate. This may limit its ability to cause severe illness or high transmissibility, at least until further adaptations occur.Also Read: New COVID Variant XFG Surfaces in India with 163 Confirmed CasesUnlike Delta, which was known for increased severity, or Omicron, which brought explosive transmission, XFG currently falls somewhere in the middle. It exhibits mild upper respiratory symptoms in most patients, especially those with pre-existing immunity.Though less prevalent, NB.1.8.1 is another subvariant drawing scientific attention due to its high ACE2 affinity—a trait that may allow it to latch onto and enter human cells more effectively. The variant was detected in a 29-year-old woman in Pune and has since been associated with potential for future surges.“NB.1.8.1 possesses both high immune escape and strong receptor binding. It could be a future concern if its circulation increases,” said Dr. Karyakarte.Meanwhile, LF.7.9, found in 34 cases, is another Omicron sub-lineage showing similar immune escape properties. Its presence across multiple samples in Maharashtra indicates that it could become more widespread if not contained.While none of these variants have yet been linked to higher hospitalizations or severe outcomes, their ability to evade immune defenses warrants continued public health vigilance.The booster coverage in India and several other countries remains uneven, especially among vulnerable populations and the elderly. Experts caution that waning immunity may provide fertile ground for variants like XFG to spread.Though current vaccines are still believed to offer protection against severe disease, ongoing surveillance and potentially updated vaccines may be needed to maintain herd protection.Furthermore, genomic surveillance—once a behind-the-scenes public health tool—has now become an essential weapon in the fight against pandemic fatigue and viral resurgence.The virus will evolve for survival, variants like XFG show us that COVID-19 is not done evolving. We must match that with equally strong public health intelligence.While there is no immediate cause for panic, especially with XFG not linked to a surge in deaths or ICU admissions, its silent spread and immune evasion traits are reasons for strategic concern.