Drug profile

The FDA adverse-event record for Mannheimia Haemolytica, Strain Nl-1009

44 adverse-event reports submitted to the FDA Center for Veterinary Medicine reference Mannheimia Haemolytica, Strain Nl-1009. See the species affected, top reactions, and outcomes below.

44
adverse-event reports
84.1%
death-coded share
Cattle
most-reported species
28
Death - top reaction
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Important: Adverse event reports do not establish that a drug caused or contributed to the event. Consult your veterinarian before making treatment decisions.
44
Total Reports
37
Deaths Reported
84.1%
Death Rate

Active Ingredients

Mannheimia Haemolytica, Strain Nl-1009

Administration Routes

Subcutaneous

Species Affected

Cattle 44

Most Affected Breeds

Cattle (other) 20
Mixed (Cattle) 16
Holstein-Friesian also known as Holstein 6
Aberdeen Angus 1
Red Angus 1

Most Reported Reactions

Death 28
Lack of efficacy (bacteria) - NOS 18
Lack of efficacy - NOS 16
NT - Abnormal necropsy finding NOS 6
Other abnormal test result NOS 6
Necropsy performed 6
CULTURE/TITER DATA ABNORMAL 5
Lack of efficacy (bacteria) - Mannheimia haemolytica 5
Abnormal test result 4
Increased mortality rate 3
Pulmonary disorder NOS 3
Intentional misuse 3

Outcome Breakdown

Died
37 (51.4%)
Outcome Unknown
21 (29.2%)
Recovered/Normal
7 (9.7%)
Ongoing
4 (5.6%)
Euthanized
3 (4.2%)

Mannheimia Haemolytica, Strain Nl-1009 Adverse Event Insights

44 reports name Mannheimia Haemolytica, Strain Nl-1009; 37 recorded a death outcome (84.1% of reported events, not a population-level mortality rate). Active ingredient: Mannheimia Haemolytica, Strain Nl-1009. Administration route: Subcutaneous.

By species: Cattle (44 reports). By breed: Cattle (other) (20), Mixed (Cattle) (16), Holstein-Friesian also known as Holstein (6).

Leading clinical signs: Death (28), Lack of efficacy (bacteria) - NOS (18), Lack of efficacy - NOS (16), NT - Abnormal necropsy finding NOS (6). Outcome, 72 coded reports: Died leads at 51.4%.

Read these counts as reporting volume, not risk: per our methodology, a widely-prescribed drug will rack up more raw FDA reports in a given year than a rarely-used one at an identical true rate, so we recommend comparing within similar-exposure products rather than across the full 2025 catalog.

Source: FDA Center for Veterinary Medicine openFDA Animal & Veterinary Adverse Events (CVM AER) · 2025

Every figure on PlainBreed is rendered directly from FDA openFDA adverse event data, no number is typed in by an editor. This page draws directly on FDA openFDA data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.