Analysis of the Comparative Occurrence of Salmonella Typhimurium and Its Monophasic Variant (4,[5],12:i:-) in Healthy and Clinically Ill Pigs in Northern Italy
The serovar Typhimurium (4,[5],12:i:1,2), is the most frequently isolated serovar in case of illness in pigs in Europe and its monophasic variant (4,[5],12:i:-) has been increasingly responsible for Salmonella outbreaks in humans. A total of 29,549 samples were collected, during the years 2002–2017, from 1,359 pig farms located in Northern Italy. Samples were collected from different material sources including fecal samples, gut content and different organs.
Salmonella was isolated in 16.94% of samples and, among the isolates, 733 were typed as Salmonella Typhimurium (ST) or its monophasic variant (MST). Over time, there was a progressive increase of isolation of MST which outnumbered ST. Most of the strains were isolated in animals during the weaning stage and the growing – fattening period whereas the clinical cases were mainly present in young pigs after weaning.
This study confirms the role of pig as a source of ST and its monophasic variant MST. In the last few years, ST has been progressively replaced by MST suggesting that MST has a competitive advantage over ST, probably due to its reduced virulence which renders the infection stealthier to recognize and control.
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Posted 15 Dec, 2020
On 25 Jan, 2021
Received 24 Jan, 2021
Received 06 Jan, 2021
On 03 Jan, 2021
On 15 Dec, 2020
Invitations sent on 11 Dec, 2020
On 09 Dec, 2020
On 09 Dec, 2020
On 09 Dec, 2020
On 08 Dec, 2020
Analysis of the Comparative Occurrence of Salmonella Typhimurium and Its Monophasic Variant (4,[5],12:i:-) in Healthy and Clinically Ill Pigs in Northern Italy
Posted 15 Dec, 2020
On 25 Jan, 2021
Received 24 Jan, 2021
Received 06 Jan, 2021
On 03 Jan, 2021
On 15 Dec, 2020
Invitations sent on 11 Dec, 2020
On 09 Dec, 2020
On 09 Dec, 2020
On 09 Dec, 2020
On 08 Dec, 2020
The serovar Typhimurium (4,[5],12:i:1,2), is the most frequently isolated serovar in case of illness in pigs in Europe and its monophasic variant (4,[5],12:i:-) has been increasingly responsible for Salmonella outbreaks in humans. A total of 29,549 samples were collected, during the years 2002–2017, from 1,359 pig farms located in Northern Italy. Samples were collected from different material sources including fecal samples, gut content and different organs.
Salmonella was isolated in 16.94% of samples and, among the isolates, 733 were typed as Salmonella Typhimurium (ST) or its monophasic variant (MST). Over time, there was a progressive increase of isolation of MST which outnumbered ST. Most of the strains were isolated in animals during the weaning stage and the growing – fattening period whereas the clinical cases were mainly present in young pigs after weaning.
This study confirms the role of pig as a source of ST and its monophasic variant MST. In the last few years, ST has been progressively replaced by MST suggesting that MST has a competitive advantage over ST, probably due to its reduced virulence which renders the infection stealthier to recognize and control.
Figure 1
Figure 1
Figure 2
Figure 2
Figure 3
Figure 3