Is it dangerous to work with rat and mice in a laboratory with low or minimum infectious control system, while the covid 19 curve in the peak in my country ?
Since transmission of this strain of Coronavirus trough rodents has not been confirmed nor discarded, you should take the maximum precaution when handling the animals closely. You must use maximum personal PPE (coat, protective googles, gloves, mask) specially if you are going to extract and process tissue from these animals.
As I understand it, mice cannot contract SARS-CoV or SARS-CoV2 (unless you have the hACE2 mouse https://www.jax.org/news-and-insights/2020/february/introducing-mouse-model-for-corona-virus# ). Your biggest risk of contraction in the lab is probably from your coworkers.