t: Proper screening of the house to prevent the entrance of the
mosquitoes (after careful search for and destruction of all those
already present in the house), and screening of the bed at night.
The chief danger of infection is at night (the Anopheles bite
mostly at this time).

Second: The screening of persons in malarial districts who are
suffering from malarial fever, so that mosquitoes may not bite them
and thus become infected.

Third: The administration of quinine in full doses to malarial
patients to destroy the malarial organisms in the blood.

Fourth: The destruction of mosquitoes by one or more of the methods
already described.

These measures, if properly carried out, will greatly restrict the
prevalence of the disease, and will prevent the occurrence of new
malarial infections.

It must be remembered that when a person is once infected, the
organisms may remain in the body for many years, producing from
time to time relapses of the fever.

A case of malarial infection in a house (whether the person is
actively ill or the infection is latent) in a locality where
Anophele mosquitoes are present, is a constant source of danger,
not only to the inmates of the house, but to the immediate
neighborhood, if proper precautions are not taken. It should be
noted in this connection that the mosquitoes may remain in a house
through an entire winter and probably infect the inmates in the
spring upon the return of the warm weather.

Malarial fever is prevalent in certain boroughs of New York City,
and in view of the presence of standing water resulting from the
extensive excavations taking place in various parts of these
boroughs, is likely to extend, if means are not taken for its
prevention.

REGULATIONS OF THE BOARD OF HEALTH, NEW YORK CITY, IN AID OF MOSQUITO
EXTERMINATION AND THE PREVENTION OF MALARIAL FEVER

(In Force from March 15 to October 15.)

1. No rain-water barrel, cistern, or other receptacle for rain-water,
shall be maintained without being tightly screened by netting, or so
absolutely covered that no mosquito can enter.

2. No cans, pails, or anything capable of holding water, shall be thrown
out or allowed to remain unburied on or about any premises.

3. Every uncovered cesspool or tank shall be kept in such condition that
oil may be freely