Thanks and sorry for the delay
Annulment is much more difficult to obtain than a divorce. In an annulment the court declares that the marriage never happened.
Arkansas grounds for an annulment include: Fraud- Marrying another by fraud or misrepresentation is a felony and is a legal ground for annulment according to Arkansas annulment laws, Duress- a marriage where one was under duress is grounds for an annulment in Arkansas, Bigamy- Arkansas annulment laws specifically prohibit bigamy, and it is a legal annulment ground, and Consanguinity- one marrying another where they are too closely related is prohibited by Arkansas annulment laws.
Not sure that your circumstances will apply...while fraud is a grounds for annulment, this typically is fraud as to a material aspect of the marriage (like if she told you she was a different person like XXXXX XXXXX vice janet doe)
Now, perhaps if you had asked her specifically about her status regarding STD's prior to marriage...and if she knew her status and lied to you regarding this, then you may have a claim
To determine, you need to contact a local attorney, here is a good resource to start
Please let me know if you have further questions; if so I will do my best to answer them. If not please hit the accept button, its the only way I get credit for my work.