Etiology, epidemiology and pathogenesis of streptococcosis with Streptococcus suis type 2 (Lancefield's group R) in the pig

(1)

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Etiology, epidemiology and pathogenesis of

streptococcosis with Streptococcus suis type 2

(Lancefield’s group R) in the pig

Josée Vaissaire, J.P. Gillet, C. Marcon

To cite this version:

(2)

-

Ig

M+ and

Ig

G+ cells accumulated

mostly

from the 1st

day

of lactation and did not

undergo morphological changes. They

could

_migrate

in

_early

lactation and

_{only undergo}

a terminal

differentiation in the _mammary

_parenchyma.

In

conclusion,

there seems to be a local and autonomous immune

_system

as shown on the one

hand

by

the _{presence of all the}

lymphoid

cells involved in an _{immune response}and on the other

hand

by

the

_{independent quantitative}

variations of blood levels.

A

new

_porcine

coronavirus in french

_pig

herds

A. JESTIN,

Y. LEFORBAN

P. VANNIER

Ministère de

l’Agriculture,

Direction de la

_Qualité,

Services

Vétérinaires,

Station de

Pathologie

Porcine,

B.P.

9,

22440

Ploufragan

Since

July

1986 a

_large

number of

pig

herds

(73 %)

in

_Brittany

have seroconverted to

transmissible

_{gastroenteritis}

_(TGE)

virus. This

_widespread

seroconversion in the absence of clinical

signs

of enteric disease

_suggests

the emergence of a new coronavirus

_{exhibiting serological}

crossreactions with TGE virus. This new virus does not cause

_digestive,

but rather

_respiratory

disorders and

might

be in some herds associated with clinical

signs

observed in

fattening pigs

such as

_{hyperthermia,}

anorexia and

_respiratory

_symptoms.

A

_study

was made in 6 herds

_exhibiting

these

_symptoms.

The

_currently

used

_etiological

methods

_{(Aujeszky’s}

disease,

influenza)

did not

explain

these disorders in 2 out of the 6 herds seroconverted to TGE virus. The aerial

transmission of the virus

_{probably explains}

the

_{rapid spread.}

Similar

_widespread

seroconversions to

TGE virus have been

reported

in

Denmark,

Belgium

and Great Britain. This infection is due to a

TGE-like virus whose nature has not been established

yet.

Etiology, epidemiology

and

_pathogenesis

of

streptococcosis

with

_{Streptococcus}

suis

type

2 (Lancefield’s

group

R)

in the

_pig

Josée

VAISSAIRE

J.P. GILLET

C. MARCON

(1)

Laboratoire Central de Recherches

Vétérinaires,

Service de

_{Bactériologie,}

22,

rue

Pierre-Curie,

B.P.

67,

94703

_{Maisons-Alfort}

Cedex.

(2)

Laboratoire Central de Recherches

Vétérinaires,

Service

_{d’Anatomopathologie,}

22,

rue

Pierre-Curie,

B.P.

67

94703

_{Maisons-Alfort}

Cedex.

(3)

D’

Vétérinaire,

« Lazuel »,

07200 Aubenas.

A

_study

on

_{streptococcal}

disease due to

_{Streptococcus}

suis

_type

2 was conducted in about

thirty pig

herds.

_Samples

_(nasal

and

_vaginal

_swabs)

were taken from live animals

_exhibiting

nervous disorders and from

healthy

carriers at the

slaughterhouse (tonsils).

According

to this

study,

the main carrier site is the tonsil.

Very

young animals are

_already

nasal and

mainly

tonsillar carriers. Transmission of the infection occurs when animals are mixed or

following

various stress or

_{immunodepressions.}

The carrier state is

_important

in _youngand

breeding

animals. The disease is little observed in

_farrowing

and

_multiplier

herds.

Pathogenesis

is similar to that of pneumococcus in human medicine. It is characterized

_by

an

angina

with rhinitis and

pneumonia turning

in some animals into

_meningitis

and