FIELD T-Z 

 Columns 58, 59, 60, and 61 



514 



5C 



52 



521 

 522 



53 



54 

 541 



5411 

 5412 



542 

 543 



5431 



5432 



55 



56 



57 



58 



Cross-tolerance; tolerance to a secondary 

 compound (Field D) due to administration 

 of the test compound. (Consult the Key. ) 



Resistance (tolerance) of an organism 

 (host) to a pathogen, parasite, non- 

 infectious pathology, or tumor. (See 

 Symbol Series 5C. For tolerance of the 

 test compound or secondary compound , 

 use Symbol 51, 511, 512, 513, 5131, 

 or 514. ) 



Pathogenicity of the parasite; virulence. 

 Use only Symbol 1 of Field T-2 with 

 Symbol 52 to code the increase of viru- 

 lence of the pathogen. Use Symbol 2 

 in Field T-1 with Symbol 52 to code 

 attenuation (decrease of virulence) of 

 the pathogen. Use Symbol 52 itself 

 only if it is not known whether the 

 effect is on the virulence of the indi- 



vidual of the species within its life- 

 time (Symbol 522) or an inheritable 

 effect on the virulence of the species 

 (Symbol 521). Use Symbols 52, 521. 

 and 522 to include all aspects of suc- 

 cessful infection by the parasite, as 

 well as ultimate intensity of symptoms 

 it can cause, such as the ability to 

 penetrate the host, the ability to estab- 

 lish in the host, etc. 



Inheritable pathogenicity of the parasite. 

 (See the definition of Symbol 52. ) 



Pathogenicity of the individual parasite. 

 (See the definition of Symbol 52. ) 



Motility 



Tropistic response, unspecified 



Phototropism or phototaxis (unspecified 

 as to whether negative or positive) 



Positive phototropism; positive phototaxis 



Negative phototropism; negative photo- 

 taxis 



Photophobia 



Chemotropism or chemotaxis (unspecified 

 as to whether negative or positive) 



Positive chemotropism or positive 

 chemotaxis 



Negative chemotropism or negative 

 chemotaxis 



Behavior of the individual. (Use Symbol 

 55 only with Symbol 6 [or L, O, or R] 

 of Field T-1. ) 



Behavior of the group. (Use Symbol 56 

 only with Symbol 6 [or L, O, or R] of 

 Field T-1. ) 



Abscission (e. g. , leaf or flower 

 abscission) or autotomy (separation by 

 an animal of one of its parts) 



Sensitization. Use Symbol 58 only for 

 the phenomenon which results from the 

 administration of certain test compounds 

 (ordinarily non- toxic proteins), develops 



during an incubation period following 

 administration, and which results in a 

 characteristic and more or less violent 

 reaction on a subsequent administration 

 of the test compound. This sensitization 

 is a process known to involve stimu- 

 lating production of antibodies and the 

 sensitive reaction (e. g. , anaphylactic) 

 is due to the antigen- antibody combi- 

 nation. For sensitivity increases not 

 falling within the specific definition of 

 sensitization, use symbols of the 51-- 

 series. 



581 Anaphylactic sensitization; stimulation 



of anaphylactin by anaphylactogen 

 1172 Anaphylactic shock 



582 Photosensitization 



59 Lag period (recovery period) following 



inoculation. Use Symbol 59 only to 

 indicate the period between introduction 

 of a microorganism into a nutrient medi- 

 um and the time at which it begins to 

 grow. Symbol 59 is not to be used for 

 latent periods following muscle or nerve 

 stimulation (Symbol Series 81-- and 

 9--). 



5A Addiction, habituation, dependence 



5B Photoperiodism. Use Symbol 5B only 



with Symbol 6 (or 8, 9, A, C, L, O, 

 or R) of Field T-1. 



5C Resistance (tolerance) of an organism 



(the host, coded in Field J) to a 

 pathogen, parasite, tumor, or non- 

 infectious disease (coded in Field E), 

 unspecified as to cause. Do not use 

 Symbol 5C itself with Symbol 1 or 2 of 

 Field T-1. Use Symbol 5C only if the 

 test compound causes resistance to 

 the pathogen, tumor, or non-infectious 

 pathology of Field E (Symbol 7 of Field 

 T-1). Use Symbol 5C1, 5C2, or 5C3 

 for an effect of the test compound on a 

 specific type of resistance to pathology. 



5C1 Resistance of an organism to a pathogen, 

 parasite, tumor, or non-infectious 

 pathology, due to exposure to a vaccine 

 or other chemical coded in Field D. 

 (Use Symbol 5C1 only with Symbol 1 or 

 2 of Field T-1. ) 



5C2 Resistance of an organism to a pathogen, 

 parasite, tumor, or non-infectious 

 pathology, due to exposure to the path- 

 ogen, tumor, or pathology in Field E. 

 (Use Symbol 5C2 only with Symbol 1 or 

 2 of Field T-1. ) 



5C3 Natural resistance of an organism to a 

 pathogen, parasite, tumor, or non- 

 infectious pathology. (Use Symbol 

 5C3 only with Symbol 1 or 2 of Field 

 T-1.) 



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