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If after vaccination and my birds suffer from a severe vaccination reaction, should I give them an antibiotic? I gave them lasota and they started to sneeze and made a rales as the breath.

If it is serious, it would be better to give antibiotics to avoid death. After the course of the antibiotic you can then revaccinate. Severe vaccination reaction usually occur if your birds have once suffered from mycoplasma gallisepticum. If that is the case, then it is better that you give antibiotic before any vaccination. After antibiotic, wait for 3 days before vaccinating.

Tnks alot!

I agree with Henlus.