Oral vaccination - dead in the water?

Farmers Guardian report today that the much vaunted oral vaccine for badgers has hit several stumbling blocks. The story reports that

Defra is understood to have conceded that the vaccine may now never reach the market and is, at best, ‘many more years away’ than had been anticipated until recently.

and

Farmers Guardian understands that Defra will also admit that there is now no guarantee its researchers will ever be able develop an oral vaccine that works well enough to be licensed.

The full story is on this link.

Commenting on this news, peppered with phrases 'never reach the market' and 'no guarantee an oral vaccine will ever be developed', John Royle of the NFU said:

The injectable vaccine had little potential for widespread deployment due to the ‘very, very high costs and impracticality of using it’ and questions about its efficacy.

That would be the 'efficacy' which we questioned once again, in this posting would it?

Plan B anyone?