You are unlikely to get a virus just reading or opening an e-mail.
Viruses are normally spread by e-mail attachments.
An attachment is where a separate file is sent along with the e-mail.
An attachment could be a family photo from a relative which is fine.
But if you get an e-mail from someone you dont know, and they tell you to open the attachment, then this could be a virus.
Recently I have had scam emails from the customs people saying there was a parcel waiting for me to pick up, see details in the attachement.
I have also had one scam from a courier company saying they tried to deliver a parcel, see details in the attachment.
I have also had scam from electronic greetings card companies saying a "friend" has sent you an electronic postcard, so open the attachement.
All of these were scams and probably contained viruses. So if you get anything like this beware.
I run AVG V8 (free edition) and it does check e-mails for viruses and often lets me know if an attachment contains a virus.