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Thirteen of the 17 sampled farms did not have any M. The average within herd prevalence was 3.

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Only one farm 2 samples was positive in group B. No pattern of shedding over time could be identified in group B farms, as very few samples were positive. This study aimed at determining the prevalence of M. The study faces important limitations as we used the current, commercially available PCRs, originally manufactured for milk on colostrum samples. Diagnostic accuracy of these tests for colostrum is undocumented.

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We performed a limited validation to assure that positive samples are detected by spiking colostrum samples with M. Also, in the B group pooling of colostrum could have had an impact on the detection limit, given the high Ct value of the few positives detected, possibly other positive samples were missed.

Therefore, current prevalence estimate needs to be interpreted carefully. Because colostrum samples can only be collected at one time point just after calving , the decision was made to have the sampling performed by the farmer. High Ct values could indicate the presence of other Mycoplasma species [ 14 ], and very high Ct values may also indicate carryover of DNA between samples [ 15 ].

Even though all farmers were instructed to take milk samples as aseptically as possible through an on-site demonstration, it is possible the actual sampling was not done lege artis in every case. Taking these limitations into account, using these PCRs, M. It is unclear whether the concentration of bacteria present in colostrum would suffice to infect calves, especially in the case of marginally positive samples. Furthermore, the presence of live bacteria was not verified in this study and should be investigated further.

The main finding of this study was that M. In the herds where a longitudinal follow-up was done, only two positive samples were found on a total of samples, while M. A variation of colostral shedding was seen between the tested herds in this study, which could indicate differences in excretion of M. Hypothetically, this could be based on the time of introduction of M. However, herd 17 was experiencing a large outbreak of M. Colostral shedding of M. One could suppose that farms suffering from M. Given that case selection in group A was based on M.

However, group B farms were all selected based on M. Overall, the within herd prevalence of M. This might point to the fact that some individual herds are more affected, depending on the timing of infection of periparturient cows.

Alternatively, it might be the consequence of false positive PCR results due to sample contamination or the presence of other Mycoplasma species [ 14 , 15 ]. In conclusion, correct interpretation of the present results is crucial. The DNA presence does not provide any information on the infectious risk of colostrum. Further work is needed to determine the risk of transmission trough colostrum and whether cows positive in colostrum have continued shedding in milk later in lactation. Based on the findings of this study, farmers and veterinarians might be motivated to apply the precautionary principle and decontaminate colostrum or purchase colostrum replacer.

Discarding colostrum of cows suffering from M. We also recommend practitioners and farmers to avoid pooling of colostrum in infected farms.

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Pasteurization [ 9 ] and purchase of colostrum replacers are options, whereas freezing and subsequent thawing only reduces M. Acid treatment [ 18 ] of colostrum could be investigated as an alternative. Herd health advisors need to be aware that the investment cost for on-farm pasteurization and purchase of colostrum replacers might be high and that negative effects on herd immunity might be the consequence. Therefore, these measures are potentially not in economic equilibrium with the transmission risk via colostrum.

The authors wish to thank the lab technicians and all participating farmers and practitioners for their kind cooperation.

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LG and JE gathered part of the samples and did data collection. FG and KS supervised the laboratory work. All authors read and approved the final manuscript. Consent was obtained from all clients to use the colostrum milked post partum for this study. Sampling was generally done by the client or the farm veterinarian, following established guidelines and adherent to the high standards of veterinary care.

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations. Linde Gille, Email: eb. Julien Evrard, Email: eb. Jozefien Callens, Email: eb. Filip Boyen, Email: eb. Freddy Haesebrouck, Email: eb. Piet Deprez, Email: eb. Bart Pardon, Email: eb. Read article at publisher's site DOI : Pathogens , 9 8 , 06 Aug To arrive at the top five similar articles we use a word-weighted algorithm to compare words from the Title and Abstract of each citation. Vet Microbiol , , 06 Feb Cited by: 1 article PMID: Acta Vet Scand , , 22 Feb Total Free Checking.

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