The government has extended the validity of the measure, which contains a strong non-recommendation to travel to countries with an extreme risk of coronavirus infection, until Aug 31, Health Minister Adam Vojtěch announced. The so-called black countries with extreme risk of infection include Botswana, Brazil, India, South Africa, Colombia, Lesotho, Malawi, Mozambique, Namibia, Nepal, Paraguay, Peru, Russia, Swaziland, Tanzania, Tunisia, Zambia and Zimbabwe. When returning from these countries, fully vaccinated tourists or those who have suffered Covid-19 in the last 180 days do not need to test and self-insulate. Others must undergo a PCR test before the trip, after returning they remain in self-isolation for 10 days, ending with a negative PCR test. The government has allowed long-term stays for university students from countries at extreme risk of spreading coronavirus. Otherwise, for example, medical students would lose another academic year, Vojtěch said.