Corona Virus: Why are experts worried about the new Omicron strains PA4 and PA5?

 Two new strains of the Omicron mutant are causing a rapid resurgence of COVID-19 infections around the world.

The two new Omicron PA4 and PA5 strains appeared. In South Africa, they may soon become the most prevalent in Europe and the United States, according to experts' expectations.

What are these two strains?

Since Covid was first discovered, it mutates and changes its shape, and the genetic copies that emerge from this are called mutants.

To date, the main mutations that emerged from Covid are still few. Including alpha and delta, which caused strong waves of infection.

PA.4 and PA.5 are the last to emerge from the Covid mutant, and are closely related to the omicron mutant; Hence the fear of experts.