Dr. Ronald Wilson: The Toronto EEG Clinic Hepatitis B Outbreak

Dr. Ronald Harold Wilson, a University of Western Ontario-trained neurologist and, at one time, chief of neurology at Centenary Health Centre in Scarborough, operated a chain of half a dozen EEG (electroencephalography) clinics across Scarborough, North York, Markham, Ajax, and Pickering between 1990 and 1996. The clinics performed EEGs — used to diagnose epilepsy, headaches, and brain-stem disorders — using needle electrodes inserted into patients' scalps, a technique the tests did not require; disposable paddles and tape are the routine method.

A Preventable Outbreak

The needle procedures were carried out for over twenty years by Wilson's technician and long-time partner, Nicholas Kyprianou, who did not wear gloves and reused electrodes without adequate sterilization. Kyprianou was later found to be carrying a highly infectious strain of hepatitis B and was identified as the source of the outbreak. Patients frequently left the clinic with blood running down their necks or faces; one witness recalled a frightened 12-year-old boy leaving in tears with blood trickling down the side of his face.

Former employees and senior hospital staff warned the Ontario Ministry of Health and the College of Physicians and Surgeons of Ontario (CPSO) about poor infection control at the clinics as early as 1991, and again in 1992 — including the lack of gloves and concerns about unnecessary testing volumes. No action was taken. The outbreak was only uncovered in January 1996 by public health officials, five years after the first warning and after the last documented infection (January 17, 1996). Just before inspectors arrived, Wilson destroyed the needle electrodes later implicated in spreading the disease.

As many as 14,000 people were exposed. Roughly 1,000 became infected — an infection rate about 600 times the general Ontario rate — and one man died. Many patients became critically ill, and others remain carriers facing an elevated long-term risk of cirrhosis or liver cancer. It was the first documented hepatitis B outbreak traced to an EEG clinic.

Lawsuit and Discipline

In late 2001, Wilson settled a class-action lawsuit brought by former patients for $27.5 million — at the time, the largest medical malpractice settlement in Canadian history. He continued practising in Toronto while awaiting his CPSO disciplinary hearing.

Following an 11-day hearing, the CPSO Discipline Committee ruled on August 21, 2002 that Wilson had committed professional misconduct and was incompetent, citing his "egregious" failure to supervise and audit Kyprianou's conduct over more than twenty years. The Committee called his conduct disgraceful. On November 12, 2002, it ordered his certificate of registration revoked immediately and ordered him to pay $25,000 in costs.

Wilson appealed. On November 5, 2003, the Divisional Court upheld the findings of professional misconduct and incompetence but set aside the revocation as an unreasonable penalty, holding that the risks tied to his role supervising the EEG clinic as medical director would not necessarily recur in his ordinary neurology practice. The court substituted a two-year suspension from practising as a neurologist (retroactive to November 12, 2002), a lifetime ban from acting as a medical director of any facility, and required remedial coursework recognized by the Canadian and American Neurological Societies. His suspension was formally lifted in November 2004, and he continued to hold a restricted certificate of registration. Wilson did not resign his CPSO membership until June 4, 2024 — more than two decades after the outbreak was exposed. Kyprianou, the technician responsible for transmitting the infection, was never a regulated health professional and has never faced discipline.

Timeline

• 1990–1996EEG clinics operated by Wilson and technician Nicholas Kyprianou across the Toronto area, using reused, unsterilized needle electrodes.
• 1991 & 1992Former employees and staff warn the Ministry of Health and CPSO about infection-control problems at the clinics; no action taken.
• Jan 1996Public health officials uncover the hepatitis B outbreak; the College subsequently bans needle electrodes for EEGs.
• Late 2001Wilson settles a class-action lawsuit for $27.5 million, then the largest malpractice settlement in Canadian history.
• Aug 21, 2002CPSO Discipline Committee finds Wilson guilty of professional misconduct and incompetence.
• Nov 12, 2002Committee orders his certificate of registration revoked and orders $25,000 in costs.
• Nov 5, 2003Divisional Court upholds the misconduct findings but overturns the revocation, substituting a two-year suspension, a lifetime medical-director ban, and remedial coursework.
• Nov 2004Suspension lifted; Wilson continues under a restricted certificate.
• Jun 4, 2024Wilson resigns his CPSO membership.