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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue Jan 2014, 35 (1)                                     Back

nstantaneous and historical temperature effects on a-pinene

Hazard prioritization and risk characterization of antibiotics in an irrigated Costa Rican region used for intensive crop, livestock

and aquaculture farming



Elba de la Cruz1*, Mara Luisa Fournier1, Fernando Garca2, Andrea Molina3,

Guadalupe Chavarra3, Margarita Alfaro3, Fernando Ramrez1 and Csar Rodrguez2

1Instituto Regional de Estudios en Sustancias Txicas (IRET). Universidad Nacional, Campus Omar Dengo, Heredia, 86-3000, Costa Rica

2Centro de Investigacin en Enfermedades Tropicales (CIET) and Facultad de Microbiologa. Universidad de Costa Rica, Ciudad

Universitaria Rodrigo Facio, San Pedro de Montes de Oca, 2060, San Jos, Costa Rica

3Centro de Investigacin en Nutricin Animal (CINA). Universidad de Costa Rica, Ciudad Universitaria Rodrigo Facio,

San Pedro de Montes de Oca, 2060, San Jos, Costa Rica

*Corresponding Author E-mail:






 Publication Data

Paper received:

28 September 2012


Revised received:

21 April 2013



05 September 2013




Antibiotics alter the homeostasis of microbial communities and select for antibiotic-resistant bacteria in the wild. Thus, the accumulation of unnaturally high concentration of these substances in the environment due to their use in human activities can be regarded as a neglected form of pollution, especially in countries with agricultural-based economies. Qualitative and quantitative information on antibiotic usage in Costa Rica is scarce, hence the design and enforcement of prevention strategies and corrective measures is difficult. To address this issue, and aiming in the long run to contribute with a more rational use of pharmaceuticals in the tropics, we characterized the hazard associated with the antibiotics used during 2008 in agriculture, aquaculture, pig farming, veterinary medicine and human medicine in the major irrigation district of Costa Rica. Hazard indicators were calculated based on antibiotic use and a weighted algorithm that also considered antibiotic fate, toxicity, and resistance. Moreover, hazard quotients were computed using maximum environmental concentrations reported for Costa Rican surface waters and predicted no effect concentrations for aquatic organisms. The number of antibiotics used in the ATID during the study were n = 38 from 15 families. Antibiotic consumption was estimated at 1169-109908 g ha-1 year-1 and, distinctively, almost half of this figure was traced back to phenicols. Tetracyclines, with a particular contribution of oxytetracycline, were the most widely used antibiotics in agriculture and veterinary medicine. Oxytetracycline, florfenicol, chlortetracycline, sulfamethoxazole, erythromycin, ciprofloxacin, enrofloxacin, sulfamethazine, trimethoprim and tylosin, in that order showed the highest hazard indicators. Moreover, hazard quotients greater than 1 were calculated for oxacillin, doxycycline, oxytetracycline, sulfamethazine, and ciprofloxacin. Studies dealing with the ecotoxicology of tetracyclines, sulfonamides and quinolones, as well as surveys of phenicol resistance among environmental bacteria, should be prioritized in Costa Rica. 


Key words


Antibiotics, Aquatic ecosystems, Costa Rica, Hazard indicators, Hazard quotients



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