Table 1. Countries and states and their observed periods.
| Country | State | First observation | Last observation | Country | State | First observation | Last observation |
|---|---|---|---|---|---|---|---|
| Albania | 2020-03-09 | 2020-04-19 | Slovenia | 2020-03-05 | 2020-05-03 | ||
| Argentina | 2020-03-18 | 2020-05-10 | Sri Lanka | 2020-02-18 | 2020-03-24 | ||
| Armenia | 2020-03-03 | 2020-05-03 | Switzerland | 2020-02-26 | 2020-04-26 | ||
| Australia | New South Wales | 2020-03-12 | 2020-05-14 | Thailand | 2020-01-22 | 2020-05-16 | |
| Australia | Queensland | 2020-04-08 | 2020-05-10 | Turkey | 2020-03-19 | 2020-05-24 | |
| Australia | South Australia | 2020-03-18 | 2020-05-14 | United Kingdom | 2020-02-27 | 2020-05-24 | |
| Australia | Victoria | 2020-03-24 | 2020-04-10 | Ukraine | 2020-03-04 | 2020-05-10 | |
| Austria | 2020-02-29 | 2020-04-13 | United Arab Emirates | 2020-01-29 | 2020-05-24 | ||
| Bangladesh | 2020-03-08 | 2020-05-09 | Uruguay | 2020-03-23 | 2020-05-23 | ||
| Belgium | 2020-03-01 | 2020-05-10 | US | Puerto Rico | 2020-03-15 | 2020-03-29 | |
| Bolivia | 2020-03-15 | 2020-05-24 | US | Alaska | 2020-03-11 | 2020-04-24 | |
| Bosnia and Herzegovina | 2020-03-09 | 2020-04-30 | US | Alabama | 2020-03-14 | 2020-04-29 | |
| Bulgaria | 2020-03-09 | 2020-05-24 | US | Arkansas | 2020-03-12 | 2020-05-03 | |
| Canada | Alberta | 2020-03-08 | 2020-05-13 | US | Arizona | 2020-03-02 | 2020-05-03 |
| Canada | British Columbia | 2020-03-20 | 2020-05-13 | US | California | 2020-03-06 | 2020-05-13 |
| Canada | Manitoba | 2020-03-26 | 2020-05-03 | US | Colorado | 2020-03-09 | 2020-04-30 |
| Canada | New Brunswick | 2020-04-01 | 2020-05-07 | US | Connecticut | 2020-03-08 | 2020-05-19 |
| Canada | Newfoundland and Labrador | 2020-03-28 | 2020-05-10 | US | Delaware | 2020-03-11 | 2020-05-07 |
| Canada | Nova Scotia | 2020-03-17 | 2020-04-30 | US | Florida | 2020-03-05 | 2020-05-24 |
| Canada | Ontario | 2020-02-05 | 2020-05-18 | US | Georgia | 2020-03-07 | 2020-05-24 |
| Canada | Quebec | 2020-03-17 | 2020-05-10 | US | Hawai | 2020-03-09 | 2020-05-06 |
| Chile | 2020-03-27 | 2020-05-24 | US | Iowa | 2020-03-10 | 2020-05-24 | |
| Colombia | 2020-03-07 | 2020-05-24 | US | Idaho | 2020-03-12 | 2020-04-30 | |
| Cuba | 2020-03-23 | 2020-05-24 | US | Illinois | 2020-03-04 | 2020-05-24 | |
| Cyprus | 2020-03-29 | 2020-05-03 | US | Indiana | 2020-03-07 | 2020-05-03 | |
| Czech Republic | 2020-03-02 | 2020-04-30 | US | Kansas | 2020-03-10 | 2020-05-03 | |
| Denmark | 2020-02-27 | 2020-04-14 | US | Kentucky | 2020-03-07 | 2020-04-19 | |
| Denmark | Faroe Islands | 2020-03-05 | 2020-05-02 | US | Louisiana | 2020-03-10 | 2020-05-14 |
| El Salvador | 2020-04-05 | 2020-05-24 | US | Massachusetts | 2020-02-03 | 2020-05-17 | |
| Estonia | 2020-02-27 | 2020-05-10 | US | Maryland | 2020-03-07 | 2020-05-14 | |
| Ethiopia | 2020-03-30 | 2020-05-24 | US | Maine | 2020-03-11 | 2020-05-10 | |
| Fiji | 2020-03-19 | 2020-05-24 | US | Michigan | 2020-03-11 | 2020-05-06 | |
| Finland | 2020-02-28 | 2020-05-12 | US | Minnesota | 2020-03-07 | 2020-04-26 | |
| France | 2020-02-25 | 2020-03-15 | US | Missouri | 2020-03-12 | 2020-05-04 | |
| Gibraltar | 2020-03-13 | 2020-04-30 | US | Mississippi | 2020-03-13 | 2020-04-26 | |
| Hungary | 2020-03-06 | 2020-04-29 | US | Montana | 2020-03-11 | 2020-04-26 | |
| Iceland | 2020-02-28 | 2020-05-03 | US | North Carolina | 2020-03-04 | 2020-05-07 | |
| Iran | 2020-04-09 | 2020-04-19 | US | North Dakota | 2020-03-11 | 2020-05-14 | |
| Ireland | 2020-03-19 | 2020-05-17 | US | Nebraska | 2020-03-08 | 2020-05-24 | |
| Israel | 2020-02-26 | 2020-04-19 | US | New Hampshire | 2020-03-05 | 2020-05-02 | |
| Italy | 2020-02-25 | 2020-05-03 | US | New Jersey | 2020-03-07 | 2020-05-17 | |
| Kazakhstan | 2020-03-14 | 2020-05-03 | US | New Mexico | 2020-03-11 | 2020-05-15 | |
| Kuwait | 2020-05-14 | 2020-05-24 | US | Nevada | 2020-03-09 | 2020-05-08 | |
| Latvia | 2020-03-02 | 2020-05-14 | US | New York | 2020-03-06 | 2020-05-15 | |
| Liechtenstein | 2020-03-05 | 2020-04-29 | US | Ohio | 2020-03-11 | 2020-05-03 | |
| Lithuania | 2020-02-29 | 2020-04-27 | US | Oklahoma | 2020-03-08 | 2020-04-24 | |
| Luxembourg | 2020-02-29 | 2020-04-19 | US | Oregon | 2020-03-01 | 2020-05-14 | |
| Malta | 2020-03-07 | 2020-05-02 | US | Pennsylvania | 2020-03-07 | 2020-05-24 | |
| Nepal | 2020-01-29 | 2020-05-24 | US | Rhode Island | 2020-03-03 | 2020-05-09 | |
| New Zealand | 2020-03-02 | 2020-04-21 | US | South Carolina | 2020-03-09 | 2020-04-19 | |
| North Macedonia | 2020-03-18 | 2020-04-21 | US | South Dakota | 2020-03-11 | 2020-05-24 | |
| Pakistan | 2020-03-12 | 2020-05-08 | US | Tennessee | 2020-03-08 | 2020-04-27 | |
| Panama | 2020-03-10 | 2020-05-12 | US | Texas | 2020-03-06 | 2020-05-24 | |
| Paraguay | 2020-03-10 | 2020-05-03 | US | Utah | 2020-03-10 | 2020-05-24 | |
| Peru | 2020-03-06 | 2020-05-24 | US | Virginia | 2020-03-09 | 2020-05-14 | |
| Portugal | 2020-03-02 | 2020-05-01 | US | Vermont | 2020-03-10 | 2020-04-24 | |
| Romania | 2020-03-13 | 2020-05-24 | US | Washington | 2020-02-07 | 2020-05-02 | |
| Russia | 2020-03-07 | 2020-05-24 | US | Wisconsin | 2020-03-06 | 2020-04-27 | |
| Saudi Arabia | 2020-03-02 | 2020-04-28 | US | West Virginia | 2020-03-11 | 2020-05-04 | |
| Senegal | 2020-03-03 | 2020-05-24 | US | Wyoming | 2020-03-12 | 2020-05-12 | |
| Slovakia | 2020-03-06 | 2020-04-13 |