The Great and Almighty, has forbidden pork and stated its impurity! He Says (interpretation of meaning): {Say (O Muhammad (Sallallahu Alaihi wa Sallam): "I find not in that which has been revealed to me anything forbidden to be eaten by one who wishes to eat it, unless it be Maitah (a dead animal) or blood poured forth (by slaughtering or the like), or the flesh of swine (pork); for that surely is impure or impious (unlawful) meat (of an animal) which is slaughtered as a sacrifice for others than Allah (or has been slaughtered for idols or on which Allah's Name has not been mentioned while slaughtering). But whosoever is forced by necessity without willful disobedience, nor transgressing due limits; (for him) certainly, your Lord is Oft-Forgiving, Most Merciful".} [6:145].
Shari'a gives no any specific justification for such prohibition except the Qur'anic term "Rijs", which means impurity and dirt from linguistic point of view. But, in Shari'a, it means dirt, abomination and taboo. It also means each and every action that is refused by sound disposition. He Says: {…, and prohibits them as unlawful Al-Khaba'ith (i.e. all evil and unlawful as regards things, deeds, beliefs, persons and foods), …} [7:157].
So, everything that which Allah has prohibited is noxious and repulsive. Furthermore, noxious things indicate everything that spoils man's life: in his health, property or morals.
In past, Muslims had no detailed information concerning noxiousness of pig or cause of prohibition. Then, modern scientific studies provide us with important information concerning diseases and harmful germs that are spread originated by pig. Among these harmful are germs and a tapeworm called "Treichine" (trichina) which grows in the flesh of swine and occupies human intestines resisting all medicines used to discharge it. Also, such an armed tapeworm may cling within one's muscles, resisting medicine to remove it. Thus, science gives a clear-cut justification for prohibition of the flesh of swine and wisdom becomes visible.
According to Larousse, a French encyclopedia, the noxious worm "Treichine" (trichina) passes along the human body heading for heart, and then, settles in one's muscles, especially in chest, eye, throat and midriff, where its embryos remain alive for years.
In addition to what is mentioned above, science may give much more information about diseases caused by swine.
Here, it is very important to state that Islam does not endorse a claim of those who think that modern technical supervision over breeding, feeding and housing of pigs can kill such germs.
Since scientific research is continuous and developing, this leads us to believe in more possible harms of eating pork will be discovered; and herein lies the ultimate prohibition of Shari'a, whether we know or do not know the reasons and wisdom behind it.
As a final word, even if it is possible to raise pigs free from such defects and harms in some or many places in modern world, it is impossible have such a state worldwide; even so the everlasting Shari'a rulings are suitable for all times and all places.

Thus, the prohibition was general and comprehensive.