Don't forget that there are a number of viruses out there now with the capability to spread themselves. It is entirely possible and likely that the sender is unaware of the the fact that they sent you a virus. It is always a good idea to contact the sender and let them know that they are sending out viruses. Most often, they will thank you and take the steps to disinfect their machines.
Dig Deeper on Malware, virus, Trojan and spyware protection and removal
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