主题词：Travel-related health issues; Parasites and Host Interactions; Malaria Research and Control; Mosquito-borne diseases and control; Viral Infections and Outbreaks Research; Viral gastroenteritis research and epidemiology; Vaccine Coverage and Hesitancy; Viral Infections and Vectors; Parasitic Diseases Research and Treatment; COVID-19 epidemiological studies; Zoonotic diseases and public health; Global Healthcare and Medical Tourism; Parasite Biology and Host Interactions; Research on Leishmaniasis Studies; Tuberculosis Research and Epidemiology; Salmonella and Campylobacter epidemiology; Child Nutrition and Water Access; Immune responses and vaccinations; COVID-19 Clinical Research Studies; SARS-CoV-2 and COVID-19 Research; Virology and Viral Diseases; Hepatitis Viruses Studies and Epidemiology; Global Health and Surgery; HIV/AIDS Research and Interventions; Vector-borne infectious diseases