Original sentence: After 1986 the vaccine market improved, with sales of some vaccines, such as Gardasil and Prevnar, exceeding $1 billion worldwide, although most vaccines sell for much less.Historically, vaccines have been a source of modest profits, and at least occasionally sources of serious losses: between 1967 and 1986, the vaccine industry suffered a sustained decline in which several major manufacturers ceased production and remaining firms threatened to shut down.Manufacturers have complained of the high liability risk and low prices paid for vaccines by the CDC and other U.government agencies
Edited sentence: Allegations of a fiscally-motivated conspiracy by manufacturers ignore these realities.Besides low profits, manufacturers have also complained of the high liability risk and low prices paid for vaccines by the CDC and other US government agencies.Between 1967 and 1986, the vaccine injury suffered a sustained decline, in which several major manufacturers ceased production and the remaining firms threatened to shut down the entire industry.Currently, the vaccine market is much improved, with sales of some vaccines, such as Gardasil and Prevnar, exceeding $1 billion worldwide, but these figures are not exceptional for modern pharmaceuticals, and most vaccines sell for much less.Historically, vaccines have been a source of modest profits, and at least occasionally sources of serious losses.In reality, the amount of money that would have to be spent to sustain such a coverup in the US alone could easily exceed any known or plausible figure for vaccine sales or profits