CREATE TABLE table_15912 ("Year" TEXT, "Typhus" FLOAT, "Typhoid fever" FLOAT, "Relapsing fever" FLOAT, "Smallpox" FLOAT, "Malaria" TEXT)

what is the number of smallpox when typhoid fever is 293
SELECT MAX("Smallpox") FROM table_15912 WHERE "Typhoid fever" = '293'
SELECT MAX("Smallpox") FROM "table_15912" WHERE "Typhoid fever" = '293'