The probability of European citizens becoming infected with communicable diseases during the Jubilee 2025 is low if general preventive measures are applied (e.g. being fully vaccinated according to national immunisation schedules, following advice regarding hand and food hygiene and respiratory etiquette, self-isolating with flu-like symptoms until they resolve, wearing a mask in crowded settings, seeking prompt testing and medical advice as needed, and practising safe sex). This is particularly important in relation to vaccine-preventable diseases that may be on the rise, such as measles, whooping cough, and COVID-19.