How can you treat a trematoda infection?

support immune system,drain accumulations of infected material, enforce adequate nutrition, identify and eliminate source of infection, determine offending organism and use anti-infective agents...

You need to take your gerbil to a vet who works with exotic animals so you can get the right antibiotic.

I belive by taking antibiotics.

Take the pup to the vet, they will most like give you an antibiotic drop solution to put in the ears.

A dermatologist or general practitioner can write you a prescription for medicine to treat a staph infection. This is commonly a simple topical gel called bactroban which kills bacteria such as staph.