1.   Swine fever is a highly contagious and usually fatal disease affecting hogs.

2.   Swine fever is a highly contagious disease affecting hogs which is usually fatal.

3.   Swine fever is a highly contagious, usually fatal disease affecting hogs.

4.   Swine fever is a highly-contagious, usually fatal, disease affecting hogs.

5.   Swine fever is a highly contagious, usually fatal, disease affecting hogs.

6.   The highly contagious, usually fatal, disease affecting hogs has struck at least two farms in the Brabant region, according to an Agriculture Ministry press release.