Important: Adverse event reports are voluntarily submitted and do not prove causation. Consult your veterinarian for medical decisions about your chicken.
421
Total Reports
244
Deaths Reported
5800.0%
Death Rate
0.2 yr
Avg Age at Report
Average weight at time of report: 1.6 kg (3.5 lbs)
Top Reported Reactions
Death 169
Lack of efficacy (protozoa) - Coccidia 96
Increased mortality rate 71
Lack of efficacy - NOS 66
Loss of egg quantity 32
Accidental exposure 23
Enteritis 20
Lack of efficacy (bacteria) - NOS 20
Anorexia 19
NT - Abnormal necropsy finding NOS 18
Digestive tract disorder NOS 16
INEFFECTIVE, COCCIDIA 15
Loss of egg quality 14
Dermatitis 13
Death by euthanasia 12
Most Referenced Drugs
Narasin + Nicarbazin 121
Narasin 78
Monensin Sodium 69
Avilamycin 31
Tylosin 28
Narasin, Nicarbazin 27
Hygromycin B 20
Tylosin Tartrate 15
Monensin 14
Bacitracin Methylene Disalicylate 9
Zoalene 8
Nicarbazin 7
Coccidiosis Vaccine 6
Amprolium 5
Tylosin Phosphate 5
Outcome Breakdown
Died
239 (53.8%)
Outcome Unknown
154 (34.7%)
Recovered/Normal
25 (5.6%)
Euthanized
11 (2.5%)
Ongoing
8 (1.8%)
Recovered with Sequela
7 (1.6%)
Gender Distribution
Unknown 161 (38.2%)
Mixed 145 (34.4%)
Female 86 (20.4%)
Male 29 (6.9%)
Reports by Year
| Year | Reports | Trend |
|---|---|---|
| 2010 | 42 | |
| 2011 | 47 | |
| 2012 | 40 | |
| 2013 | 42 | |
| 2014 | 31 | |
| 2015 | 37 | |
| 2016 | 44 | |
| 2017 | 29 | |
| 2018 | 27 | |
| 2019 | 14 | |
| 2020 | 8 | |
| 2021 | 11 | |
| 2022 | 22 | |
| 2023 | 9 | |
| 2024 | 16 | |
| 2025 | 2 | |
Source: FDA Center for Veterinary Medicine — Adverse Event Reports. Rank #150 by report volume. Data reflects voluntary submissions and may not represent actual incidence rates.