[11: https://www.dhs.gov/news/2020/03/11/homeland-security-acting-secretary-chad-f-wolf-s-statement-presidential-proclamation ][12: https://www.dhs.gov/news/2020/03/16/department-homeland-security-outlines-new-process-americans-returning-schengen-area ][13: COM(2020) 115 final of 16 March 2020.
[11: https://www.dhs.gov/news/2020/03/11/homeland-security-acting-secretary-chad-f-wolf-s-statement-presidential-proclamation ][12: https://www.dhs.gov/news/2020/03/16/department-homeland-security-outlines-new-process-americans-returning-schengen-area ][13: COM(2020) 115 final od 16. ožujka 2020.][14: Sjedinjene Američke Države izdale su od 19. ožujka globalno zdravstveno upozorenje za cijeli svijet na razini 4, najvišoj mogućoj, savjetujući da se ne putuje.