I think the key word here is "older" not insulin. Regardless, the 3 watchwords when giving our animals any kind of treatment are always cleanliness, cleanliness, and cleanliness. And did I mention cleanliness? :-) I'm not going to tell you about properly storing and disposing of needles because you've already learned that lesson the hard way. But throughly washing your hands before and after you inject your cat is always important to protect your cat as well as yourself. In the case of needle sticks, after thoroughly washing the area, you should contact your physician or healthcare provider, especially if you have any health conditions that might make you more susceptible to infection.
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