...considered extremely probable." Other requirements are named and the circular states, if these are met: "The presence of a previous or existing typhoid infection...purposes, be practically considered as established." The circular also states: "The reaction is occasionally absent in cases of typhoid fever until the...

...amount as promptly to produce the reaction, when 1 part of scrum or dried blood solution is added to 20 parts of the culture, the presence of a previous or...the reaction is rarely, if ever, present until at len-i four days after the appearance of symptoms; that it is occasionally absent in cases of typhoid...

...one part of serum or blood solution Is added to twenty parts of a culture of the typhoid bacillus, the presence of a previous or existing typhoid infection...reaction is rarely, if ever, present until at least five days after the appearance of symptoms; that it is occasionally absent in cases of typhoid fever...

...one part of serum or blood solution is added to twenty parts of a culture of the typhoid bacillus, the presence of a previous or existing typhoid infection...reaction is rarely, if ever, present until at least five days after the appearance of symptoms; that it is occasionally absent in cases of typhoid fever...

...amount as promptly to produce the reaction, when 1 part of serum or dried blood solution is added to 20 parts of the culture, the presence of a previous or...the diagnostic value of a negative result from this lest, we must remember that the reaction is rarely, if ever, present until at least four days after...