[Tholozan and plague in Persia].

In Persia since 1858, Tholozan studied between 1870 and 1882 the plague foci of the iranian Kurdistan which shall be dealt a century later (1947-1963) with Dr. M. Baltazard and his co-workers from the Pasteur Institute of Teheran.

[The discovery by Paul-Louis Simond of the role of the flea in the transmission of the plague].

After Yersin's two fundamental discoveries of the plague bacillus and of the rat's role in its propagation, no one had sought to solve the riddle of how the bacillus itself spread and how it contaminated man. P. L.

[Concealing and denying the plague].

Some examples are given of plague epidemics which have been negated or dissimulated in order to avoid isolation and quarantine: epidemics of Marseille (1720), San Francisco (1900), Mauretania (1963-1967), Libya and Egypt (1984).