[The phase after the eradication of smallpox in Mexico, 1952-1977].

This paper studies the phase after the declaration of the eradication of smallpox in Mexico and covers the period from June 1952 (the date on which the health authorities officially proclaimed this event) to 1977 (the year in which the National Institute of Hygiene prepared the last batch of glycerinated anti-smallpox vaccine). It is revealed that during these years, the Ministry of Health and Assistance continued to invest resources in work aimed at combating smallpox to maintain the levels of protection against smallpox and to prevent the reintroduction of the disease at a time when it was still endemic in several countries worldwide; and states that the population continued to report suspected cases and attribute deaths to this disease.