"Republics" . "Scientific method" . "Member states of the Union of South American Nations" . "Landlocked countries" . "Member states of the United Nations" . "Viral respiratory tract infections" . "Countries in South America" . "Evaluation methods" . "Bolivia" . "COVID-19" . "Zoonoses" . "Andean Community" . "Former Spanish colonies" . "Evidence" . "Occupational safety and health" . "States and territories established in 1825" . "Spanish-speaking countries and territories" .