COVID has always been a matter of concern. However, various ‘COVID-causing’ variants constantly evolve or degrade (change) with time, requiring a constant vigil of the public health experts.
All viruses change with time. The same is the case with SARS-CoV-2 – the virus that causes COVID. It is natural for any virus to change with time as they spread and infect living beings. Once these variations become considerably distinct from the original disease-causing virus, the new ones are termed the variants.