The World Health Organization (WHO) believes that "immune passports", which indicate the vaccination against coronavirus, should not yet be introduced in the world. Melita Vujnovich, WHO representative in Russia, told TASS about this. Vujnovic noted that many elements need to be considered and taken into account before introducing such passports. “We are still in the early stages of understanding the full immune response to COVID-19,” added an organization spokesperson. The immune response is likely to be more complex than what can be determined by individually measuring antibodies to COVID-19 at any given time, she said. "For this reason, WHO does not recommend the use of so-called 'immune passports'," explained Vujnovic. At the end of February, the leaders of the European Union agreed to introduce electronic certificates of vaccination against coronavirus. This was announced by German Chancellor Angela Merkel. A few days ago, the Financial Times, citing diplomatic sources in the European Union, wrote that the most difficult issue in the discussion of covid passports in Brussels was the certification of vaccines not recognized in the European Union, for example, Chinese and Russian.