<s>[INST] My husband had a dog bite yesterday. We have already started anti rabies injection day 0 yesterday. 4 more to go on day3;5 10 n 21. We will try to coneive after 2months. Does this vaccine lower sperm count or has any alteration in chromosomal pattern of sperms. Do v carry any risk in developing birth defect in baby in future. If yes. For how many months should we take a break. [/INST] HelloThanks for query .Anti Rabies vaccine has no side effects on production of sperms hence will not  lower down the sperm count.Neither it will have any adverse effect on chromosomal pattern of sperms and will not have any birth defects of the baby as feared by you .Please go ahead and complete the course of anti rabies vaccine .as it is more important for him to get immunized .Dr.Patil. </s>