Treatment of infectious diseases creates “clustering” of patients – as those people who show symptoms flow to a common geographical source for treatment.   However, just like actual cells in a virus, the clustering behavior of people can become the problem.  
As the size of the population ‘cluster’ increases, so too does the need for treatment staff and supportive personnel.  As the size of the entire populous grows at the facility, the risk of expanded hosts for the virus similarly increases.   In rare cases, very rare instances, treatment facilities are closed because they themselves become the bigger risk.

(Via Gateway Pundit)  The Nigerian government today shut down the First Consultants Medical Center in Lagos to prevent the spread of the deadly Ebola virus. The chief medical director Dr. Samuel Brisbane died from the disease this week.

As part of measures to prevent the spread of Ebola Virus Disease (EVD), the World Health Organisation (WHO) and the Federal Government have shut down the hospital, First Consultants Medical Centre Limited, Ikoyi Road, Obalende, Lagos, where the first victim died.

They have also begun testing of all passengers on the same flight with the first Ebola virus victim in Nigeria who died on Friday in a Lagos hospital. Already, the WHO African Region has opened a sub-regional outbreak coordination centre in Conakry, Guinea.
It is feared that all the over 200 passengers on board are exposed to the deadly virus and may continue to spread the disease if they are not quarantined.

Authorities in Liberia are also considering plans to shut down the state run John F. Kennedy (JFK) Memorial Hospital for 21 days due to the spread of the disease.
All Africa reported:

Authorities at the state run John F. Kennedy (JFK) Memorial Hospital here are said to be considering plans to shut down all activities at the hospital for 21-days due to the increasing number of reported Ebola cases, this paper have learnt.
JFK is one of the biggest state run referral hospitals here and has ushered in a number of Ebola suspected cases, many of whom have died.
The news come amidst unconfirmed reports of the death of one of the hospital’s senior medical practitioner, Dr, Samuel Brisbane, a former Chief Medical Doctor at the Firestone Rubber Plantation run Hospital from the deadly Ebola virus here on Thursday July 24, 2014.