COVID-19 became a pandemic. Affected regions included Latin America, Africa, and Oceania. New cases continued to increase rapidly. To alert Taiwanese travelers about the potential risk, Taiwan issued Level 3 travel alerts for (besides Asia, Europe, North Africa, the United States, Canada, New Zealand, and Australia, which were already declared Level 3 travel alerts (Warning)), the entire world starting midnight 21 March. Taiwanese should avoid all non-essential international travel. Those who return from abroad must undergo a 14-day home quarantine.