Stories of Englishmen and women running away scared at the very sight of neem leaves are part of the colonial lore.
Neem was and is seen in India as some kind of protection against measles. And for the English measles was a dreaded M word, it almost meant a certain death.
But now the disease seems to have penetrated their own island, and authorities are worried.
To add to the irony of the situation, there are now reports that the disease has spread from Britain to other countries.
Last year, three cases in the United States were linked to Britain by the U.S. Centers for Disease Control and Prevention.
Measles, which can be life threatening and cause severe disabilities, is most common among children aged one to four who have not been immunized, but can strike older children and adults too.
And it is a highly contagious airborne pathogen which spreads primarily via the respiratory system. The virus is transmitted in respiratory secretions, and can be passed from person to person via aerosol droplets containing virus particles, such as those produced by a coughing patient.
According to the Health Protection Agency (HPA), there have been 480 confirmed cases of measles in the United Kingdom so far this year.
That compares with a provisional total of 756 cases last year, the highest number recorded since current monitoring began in 1995. "The number of cases is increasing at a higher rate than usual for this time of year," the HPA said.