Intercultural medical information

Some of Japanese websites about scientific information is not really credible, I think. In the sense that they use language like, "There is little possibility to transmit the virus/to suffer from the disease" (translated from Japanese). What does "little" mean??? People tend to translate these words in the way they like... In contrast, US documents use numbers such as "--% of the carriers have the possibility to transmit the virus""--% of the carriers have had the disease per year." This was a culture shock about my own culture.