Describing vehicle movement patterns within a production system in the Midwest

This is our Friday rubric: every week a new Science Page from the Bob Morrison’s Swine Health Monitoring Project. The previous editions of the science page are available on our website.

This week the MSHMP team presents the results of their latest project which proposed to first record vehicle movement patterns to then add that future disease prediction models. This is part 1 of their report. Part number 2 will be on the blog next week.

Key Points

  • Utilizing movement data to understand network connectivity can provide insights impacting disease control, animal welfare, and other areas.
  • The number of vehicle movements is constant over season and year, with no high or low seasons indicating a constant level of contacts. 
  • From this subset of transport data, most of the trips are to sow farms (32.5%) and Truck-wash facilities (37.6%).
  • The average time for vehicle cleaning, disinfection and baking (at the truck-wash facilities) was ~3hrs.
Continue reading “Describing vehicle movement patterns within a production system in the Midwest”

PRRS 2018-2020 Exponentially Weighted Moving Average (EWMA) by State

This is our Friday rubric: every week a new Science Page from the Bob Morrison’s Swine Health Monitoring Project. The previous editions of the science page are available on our website.

Dr. Kikuti and colleagues from the University of Minnesota compare PRRS 2018-20 EWMA patterns of different States.

Keypoints

  • We continue to observe different EWMA patterns across states.
  • Even though an overall higher incidence in colder months is observed, sporadic cases in warmer months were detected throughout the states.
Continue reading “PRRS 2018-2020 Exponentially Weighted Moving Average (EWMA) by State”

PRRS EWMA Analysis Review

This is our Friday rubric: every week a new Science Page from the Bob Morrison’s Swine Health Monitoring Project. The previous editions of the science page are available on our website.

Today, Dr. Vilalta and other members of the MSHMP team review the characteristics of the Exponential Weighted Moving Average (EWMA) charts for PRRS.

Key Points:

  1. The EWMA chart is a smoothed chart of the percentage of farms that are breaking.
  2. This chart is useful for tracking longitudinal data and for detecting the signals that indicate an “event”.
Continue reading “PRRS EWMA Analysis Review”

Incidence Risk and Incidence Rate: an Overview

This is our Friday rubric: every week a new Science Page from the Bob Morrison’s Swine Health Monitoring Project. The previous editions of the science page are available on our website.

Today, Dr. Juan Sanhueza helps us understand better two epidemiologic concepts: the incidence risk and incidence rate.

Key Points

  • Incidence risk is a measure of disease occurrence over a defined period of time. It is a proportion, therefore takes values from 0 to 1 (0% to 100%)
  • Incidence rate takes into account the time an individual is at risk of disease. It is not a proportion since it defines the number of cases per animal or farm time at risk.
  • Incidence risk and incidence rate are often confused. Incidence risk and rate are numerically the same when the period at risk does not vary across individuals being studied.
Continue reading “Incidence Risk and Incidence Rate: an Overview”

Use of test and removal strategy to contain an ASFV outbreak in a farm

Every week a new Science Page from the Bob Morrison’s Swine Health Monitoring Project. The previous editions of the science page are available on our website.

Today, Dr. Yao and collaborators from PIC, New Hope Liuhe, and University of Cambridge describe the implementation of a test and removal strategy on an African Swine Fever virus (ASFV) infected farm, highlighting the importance of early detection and rapid responses to contain the virus in a population.

Continue reading “Use of test and removal strategy to contain an ASFV outbreak in a farm”