My son was shocked today by an electric fence carrying over 7,800 volts. He was holding onto the metal stake that grounded it with one hand and was hold a hose in the other trying to help his granddad when he slipped and fell onto the electric wire. The voltage went through his shoulder and into his arm to the stake. He had a red rash on his arm for an hour after the incident. We put Neosporin on it and then gave him Ibuprophen for the headache. He said his arm hurt for a while after. He seemed fine about two hours later and has not had any other issues. Should we be concerned about any latent side affects?