People queueing for smallpox vaccination at the People's Clinic and the Government Outdoor Clinic on April 16, 1959.

The process to convert Singapore from a British colony to a self-governing state began a year earlier. The country achieved internal self-government in the middle of 1959, when the constitution came into force with the formation of Singapore's first fully elected government.

A mass-inoculation programme against tuberculosis, smallpox, diphtheria and poliomyelitis was also later launched.

Buy this photo at: bit.ly/smallpoxvax

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