If type 2 then why?

VDPV n VAPP are caused by which strain of poliovirus type 2 or 3??

If type 2 then why?

As opv is bivalent now. How it can happen ?

Vdpv by 2 and vapp by 3>2

2 because it has higher intestinal uptake so higher risk of getting mutated and causing vdpv…

It is bivalent now because of this reason peobably… that type 2 isn’t seen anymore cashing disease and also vaccine causes this complications

its direct and simple explanation… bivalent OPV means polio strain 1 and 3… for more info, please watch the NPSP or polio modules in ed5.