The pus collection causes pressure on the spinal cord. The infection is usually due to bacteria. Often it is caused by a staphylococcus infection that spreads through the spine. It may be caused by tuberculosis in some areas of the world, but it is not as common today as it was in the past.
From the 1830s until 1870, the abolitionist movement attempted to achieve immediate emancipation of all slaves and the ending of racial segregation and discrimination.
Quakers were not alone in this, and the key strength of the historical abolitionist movement, in Britain and North America, was the determination of the slaves themselves. Quakers nevertheless made a vital and distinctive input, in five main ways. They raised slavery as a moral issue as early as the 1670s and 80s.