I usually stick to 1 cc max for any deltoid injection I give patients. (I'm a nurse) Reason is, deltoids not that big for most patients i come across. It's NOT an infection. If you have a fever, the injection site is cherry red, you can barely move your arm, and you're either nauseated or feel like vomiting, then its probably an infection. Your deltoid wasn't used to the added stuff, and your body's taking a little bit longer than usual to process it. You'll be fine after a few days. Just stretch out the muscle every now and then. Also, after an injection, take an alcohol swab and rub the injection site to distribute the test throughout whatever muscle you injected into. This will lower the risk of any trapped test that might form a nodule in your muscle. Hope this helps.