Revert detection level change

will save these changes for a separate branch

data/associations.csv

@@ -319,7 +319,7 @@ Marituba_virus,Bradypus_tridactylus,wild,Isolation,2,Shope et al. 1988
 Mayaro_virus,Bradypus_tridactylus,wild,Antibodies,0,de Thoisy et al. 2003
 St._Louis_encephalitis_virus,Bradypus_tridactylus,wild,Antibodies,0,de Thoisy et al. 2004
 Changuinola_virus,Bradypus_variegatus,wild,Isolation,2,Seymour et al. 1983b
-Punta_Toro_virus,Bradypus_variegatus,wild,Isolation,2,Seymour et al. 1983b
+Punta_Toro_virus,Bradypus_variegatus,wild,Antibodies,0,Seymour et al. 1983b
 St._Louis_encephalitis_virus,Bradypus_variegatus,wild,Antibodies,0,Seymour et al. 1983a
 Vesicular_stomatitis_Indiana_virus,Bradypus_variegatus,wild,plaque reduction neutralization,1,Tesh et al. 1969
 Bovine_immunodeficiency_virus,Bubalus_arnee,wild,Antibodies,0,Meas et al. 2000