When buying a cat, you'd better look at the cat's appearance first, such as whether it is physically disabled, defective or sick.
It is best to choose a lively cat. When teasing it, you will understand and play with people.
Then look at the asymmetry of coat color, appearance and color pair to see if it looks good.
Finally, I asked the cat seller if he had been vaccinated to repel insects, and how many shots he had, and if there was any certificate.
It is better to buy a cat in a formal place, which is more secure. Most of the roadside words don't scream, but he will take out the vaccine bottle and say that he did, which is difficult to verify. Wait until you are infected with infectious diseases, and then go to treatment.
If they are sold in pet hospitals, pet shops and farms, most of them will remain free of infectious diseases for one month.