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Direct Droplet
It requires intimate contact and it may be difficult to be sure whether the infective material has been directly inhaled from the dispersed droplets or whether it has reached the respiratory tract of the susceptible person indirectly through the medium like hands, fomites etc. Direct droplet spread would seem to be the most likely method for transfer of respiratory pathogens that have a poor viability outside the body, e.g. cerebrospinal fever (associated with conditions of overcrowding in jails and ships).

Another example is whooping cough. The infecting microbes are in the active phase of growth and therefore are more likely to be able to attack the tissues in which they are implanted.