INFECTION CONTROL
Floor Fusarium sp.
Ceiling board backside Aspergillus sp. Preparatory work Aureobasidium sp.
Temporary partitioning erected and utilities shut off
Indentification of mould types by DNA analysis.
100000
n Before disinfection n After disinfection
10000 Doors, windows, wallboards etc, installed 1000 Ceiling piping/wiring 100 Ceiling boards attached 10 Disinfection complete 1 Block A Block B Block C Block D The effect of disinfection. Preliminary surveys were conducted on
the renovation work area and implementation plans were formulated. As measures to prevent infection, management of sealing and negative pressure, access control of workers, and export control of construction waste were carried out. In addition to those measures, we
decided to disinfect the ceiling cavity with chemical mist spray before dismantling the ceiling board to further reduce the infection risk. There are various obstacles in the ceiling cavity, such as beams, firewalls,
The renovation process.
facility piping, wiring and air conditioning ducts. Therefore, a night vision camera was attached to the spray nozzle so that the proper spray direction of the chemical could be confirmed. In addition, to maximise the disinfection effect it is important to control the amount and the concentration of the chemical and to control the relative humidity in the ceiling cavity. We have created a dedicated chemical spray cart equipped with a PC to easily control them numerically. We proceeded with the disinfection work while cultivating the dust sample and confirming the effect.
Procedure of disinfection work in renovation work Disinfection work should be done before removing the ceiling board and before removing the lighting fixtures or air conditioners. Following the progress of each process of the renovation work, we moved the chemical spray cart to the room before dismantling and carrying out disinfection. During the renovation work at Fujita Health University Hospital, we disinfected the ceiling cavity of approximately 4800 square metres from November 2017 to September 2018.
Ceiling demolition
Disinfectant fog is effective
Difficulty
separating the ceiling cavity
Renovation area
The newly developed disinfectant fogging cart for ceiling cavities of renovation work.
72 Wall to remove
Hospital traffic
Cross-section Temporary wall The difficulty of installing a temporary wall in the ceiling cavity. IFHE DIGEST 2020
Disinfectant fogging procedure
Disinfectant fogging
Fogging continues until the prescribed volume of fog has been delivered
Curing (2-3 hours)
If the nozzle is to be removed, then after its removal, the hole is sealed
Existing interior torn down Preparatory work 1
Ceiling cavity demarcated into sections and holes made from nozzles
Preparatory work 2
Ceiling cavity humidity measured and disinfectant fog volume set
Preparatory work 3
Adjustment of disinfectant solution for fogging
Preparatory work 4
Nozzle inserted into ceiling cavity and insertion point sealed
Attached fungi (per 25 cm2
)
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