The port health authorities prevent thetransmission of quarantinable diseases into and outof the territory and control the spread of othercommunicable diseases mainly through quarantineinspection, surveillance of communicable diseases,sanitary supervision and sanitary treatment. Takingthe year 2000 as an example, inspection has beencarried out on 385 810 ships, 146 399 planes,266 916 railway coaches, 14 870 364 automobiles,and 179 024 954 people entering and leaving the The port health authorities prevent the transmission of quarantinable diseases into and out of the territory and control the spread of other communicable diseases primarily through quarantine inspection, surveillance of communicable diseases, sanitary supervision and sanitary treatment. Taking the year 2000 as an example, inspection has been carried out on 385 810 ships, 146 399 planes, 266 916 railway coaches, 14 870 364 automobiles, and 179 024 954 people entering and leaving the