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The reason being that vaccinia, the disease resulting from successful vaccination, being far milder than smallpox, runs its course more quickly, taking only two days to develop, while smallpox requires anywhere from seven to twenty days to develop after the patient has been infected, or exposed.
The eminence on which we stood was overgrown with vaccinia and other plants, and we saw among them marks of its being visited by hares. Near the summit was a spot, covered with red sand, which stained one's fingers, and among it were fragments of a substance resembling cast iron.
From 6000 to 7000 feet, plants of the temperate regions blend with the tropical; such as rhododendron, oak, ivy, geranium, berberry, clematis, and shrubby Vaccinia, which all made their appearance at Loongtoong, another Bhoteea village.
So, if anyone who has been exposed to smallpox is vaccinated any time within a week after exposure, the vaccine will take hold first, and the patient will have either simple vaccinia, with its trifling headache and fever, or else a very mild form of smallpox.
Guided by the empirical success of Jenner, he, like many others, had long practised inoculation experiments, and on February 9, 1880, he announced to the French Academy of Sciences that he had found a method of so reducing the virulence of a disease germ that when introduced into the system of a susceptible animal it produced only a mild form of the disease, which, however, sufficed to protect against the usual virulent form exactly as vaccinia protects against small-pox.
But he was certain that it was only happiness that was waiting for him. Three years of success in which would be mingled the real poetry of existence. He would not write his poetry on paper; he would write it, as Herod had written it, in every action of his life. His innings was just about to begin. "Alba Ligustra cadunt; vaccinia nigra leguntur."