In the mean time Jenner had succeeded in demonstrating the protective quality against smallpox of vaccination, contracted either casually or by direct inoculation, in some twenty-three cases.
"Makers of Modern Medicine"
James J. Walsh
He remained in London for nearly three months without being able to find any one who would submit to vaccination.
"Makers of Modern Medicine"
James J. Walsh
In a way, the fate of vaccination hung in the balance and good luck was in its favor.
"Makers of Modern Medicine"
James J. Walsh