I have just read that a defective vaccine against yellow fever has been given to 304 people in Santa Cruz de Tenerife. Five of the people have needed medical treatment for nausea and other effects, all of them are said to be well, but one person who suffers from hepatitis remains in the Hospital Universitario de Canarias.
It begs the question, why were these people given the vaccine? Were they about to travel to Africa or is yellow fever (which is caused by infected mosquitoes) prevalent in Tenerife? If so should visitors from the UK be vaccinated before they arrive?