Thema
Journal Article
53
COVID-19
21
Research Support, Non-U.S. Gov't
20
SARS-CoV-2
18
ship
7
Greece
6
cruise
6
travel
6
vaccination
6
Education
5
Exercise
5
Training
5
COVID-19 Vaccines
4
Competent Authority
4
Crew Member
4
Cruise Ship
4
IgG
4
Review
4
Systematic Review
4
antibodies
4
vaccine
4
Airplane
3
Airports
3
Cross-border
3
Entry screening
3
Epidemiology
3
Infectious diseases
3
Public aspects of medicine
3
Public health
3
Training-of-trainers
3
Traveler
3
gastroenteritis
3
isolation
3
maritime
3
outbreak
3
Airport
2
Communicable Disease
2
European Union
2
European Union Country
2
European Union Member State
2
Free Chlorine
2
Ground-crossing
2
Health surveys
2
IgA
2
Infectious disease control
2
Occupational Health
2
Occupational Health Service
2
Passenger Ship
2
Pest Infestation
2
Pest Species
2
mehr ...