.- KOK MEDICAL STUDENTS CHAP. 



filters ; graduated degrees of fineness it can be deter- 



[ndicated by the infectivity of the fluid, pass 



one particular filter of the series while they are 



! astly it has been shown that the transmitting agents 



re mosquitos of the genus Stegomyia (p. 250), which if 



patient during the first three days of the disease become 



twelve (lavs later capable of inoculating the disease into a new 



- audinn's observation then gives a clear hint as to the 



,ihty. in investigating such a disease as Yellow Fever, of bearing 



in nund that the culprit organism may be a minute spirochaete and that 



uimd to lurk in such unexpected nooks in the mosquito's 



... ivtory tubes. 



th Yellow Fever in this connexion we may bracket Dengue 



..ml 1'apputari Fever. The formera widely distributed disease 



in warm regions is transmitted by mosquitos, including the species 



Yellow Fever. Pappataci or Sand-fly Fever, a common 



i the countries round the Mediterranean, is spread by the small 



- md-tly rhlebotomus. If this fly takes in infected blood from 



MI during tlu- first 24 hours of an attack it becomes after an interval 



to ten days itself capable of passing on the infection. 



CHLAMYDOZOA 



A number of disea Smallpox,, Scarlet Fever, Hydrophobia, 



1 .md Mouth disease), affecting especially the ectodermal 



nl apparently also due to microbes so minute in size as 



to pass through ordinary bacterial-filters, are characterized by the 



hin the cells ot curious rounded inclusions the staining re- 



D| which rocmhle those of achromatic nuclear material. These 



Keen Liiven by pathologists different names in the different 



diseases in which they have been observed Guarnieri's bodies. Mallory's 



ri's bodies. Prowazek's bodies and so on- and they have been 



in- intracellular parasites of protozoan nature. There 



;ieral tendency now however to regard these bodies not as actual 



material funned by the host-cell in response to the 



parasites. The actual parasites on this view are 



minute r. >undt d dot-like objects which may be observed within the cell- 

 That thoe are living organisms is indicated by their frequently 

 oi division into two, going through a dumb-bell- 

 Odies tend to become enclosed in a sheath (the 

 i given the name CHI.AMYDO/OA and they are 



