All of the following statements about 'yaws' are true, except:
Late Yaws is characterized by destructive and deforming lesions of skin, periosteum and bone. The late cardiac and cerebral manifestations of venereal syphilis, which is often severe, does not occur in yaws. Ref: Preventive and Social Medicine, by K.Park, 19th edition, Page 283, 284
Caused by Treponema paeunae
Transmitted non venerally
Secondary yaws can involve bone
Late stages of yaws involve hea and nerves