809
According to out field research , the tick fauna was very rich throughout that area , and it was permissible enough to determine ticks as the vectors , based on arising of anti - SF group rickettsiae ( SFGR ) antibody in mice inoculated with some tick emulsions , findings of rickettsiae reactive to patient sera or a species - specific monoclonal antibody to JSFR in the hemolymph cells of some ticks , and electron microscopical observations of SFGR in various internal organs including the salivary gland of ticks .
 anti - SF group rickettsiae, SFGR, JSFR, SFGR
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 anti - SF group rickettsiae, SFGR, JSFR, SFGR