I am not sure what you read, but when to get tested would depend on your circumstances and a few different factors.
For example, if you just found out your partner has HIV, it would be a good idea to get tested right away, whether you use condoms or not.
On the other hand, if you know a partner is positive and you are always using condoms, it would make sense to get routine testing. Another factor in your decision about how often to get tested would be whether the person is taking HIV medications.
All of these things will contribute to your decisions about when to get tested. When you see your healthcare provider, it is a good idea to talk about how often to get tested based on your circumstances.
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