Why does Betty keep getting mites?

[*kate*]

She has been scratching excessively for the past few days, took her to the Vet yesterday, and mites again. Fourth time in 2 years.

Usual treatment, had her first injection yesterday.

Anyone any ideas as to why she is prone to them?

 

[Piggies&buns]

Some just are unfortunately.
Anything that lowers the immune system can make it easier for such parasites to become a problem - stress for example can lower the immune system

 

[VickiA]

Some pigs are more stressy than others and as @Piggies&buns says stress lowers the immune system, and parasites are opportunists. So for some piggies it’s a change of environment, a change in companionship or sometimes disguising an underlying illness that can set them off. Hopefully the situation will soon be under control and she will feel more comfy.

 

[*kate*]

Yes I'd read that stress can trigger it but Betty is very laid back so cant imagine that stress is a factor.

Oh well I suppose we will never know!