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DIAGRAM II.
MULTIPLE CASES OF TUBERCULOSIS IN ONE FAMILY.
The thin vertical red lines indicate the life lines of the persons while in good
health. Tuberculosis, when diagnosed, is indicated by a heavy red column on
right of life line, and a positive sputum by an added column on the left. Each
small square, vertically, represents a period of six months
M= Mother, who developed pulmonary tuberculosis with a positive sputum and
died in one year. Five years after her death the elder sou A is notified as a
case of pulmonary tuberculosis, and a positive sputum appears three years after
notification. B is a younger son who developed pulmonary tuberculosis with
a positive sputum three and a half years after his brother had become infectious,
a and b are children of A, both of whom have died from tuberculous meningitis.