[CentOS] yum update (first in a long time) has broken clamd.exim

I have just run a 'yum update' on a Centos 7.2 server which updated several 
hundred RPMs.

The update worked fine with no errors or warnings

I then rebooted the server and now my EXIM is rejecting emails because the 
clamd service isn't running.

So I tried:

[root at ollie2 ~]# systemctl restart clamd.exim
Failed to restart clamd.exim.service: Unit clamd.exim.service failed to load: 
No such file or directory.
[root at ollie2 ~]# systemctl list-unit-files --type=service|grep -i exim
exim.service                                enabled 
[root at ollie2 ~]# systemctl list-unit-files --type=service|grep -i clam
clamd.service                               enabled 
clamd at .service                              static  
[root at ollie2 ~]# systemctl restart clamd 
[root at ollie2 ~]# systemctl status clamd        
● clamd.service - Home brewed module for the Clam Antivirus scanner
   Loaded: loaded (/usr/lib/systemd/system/clamd.service; enabled; vendor 
preset: disabled)
   Active: failed (Result: start-limit) since Wed 2016-05-04 16:34:16 BST; 5s 
ago
  Process: 14405 ExecStart=/root/bin/clamd.start (code=exited, 
status=1/FAILURE)
 Main PID: 14405 (code=exited, status=1/FAILURE)

May 04 16:34:16 ollie2.ringways.co.uk systemd[1]: Unit clamd.service entered 
failed state.
May 04 16:34:16 ollie2.ringways.co.uk systemd[1]: clamd.service failed.
May 04 16:34:16 ollie2.ringways.co.uk systemd[1]: clamd.service holdoff time 
over, scheduling restart.
May 04 16:34:16 ollie2.ringways.co.uk systemd[1]: start request repeated too 
quickly for clamd.service
May 04 16:34:16 ollie2.ringways.co.uk systemd[1]: Failed to start Home brewed 
module for the Clam Antivirus scanner.
May 04 16:34:16 ollie2.ringways.co.uk systemd[1]: Unit clamd.service entered 
failed state.
May 04 16:34:16 ollie2.ringways.co.uk systemd[1]: clamd.service failed.
[root at ollie2 ~]# 

Can anyone tell me what happened to clamd.exim, and what I need to do to get 
it working again.  For now I've had to comment out:

  # Deny if the message contains a virus. Before enabling this check, you
  # must install a virus scanner and set the av_scanner option above.
  #
    deny    set acl_m0 = clamd:/var/run/clamd.exim/clamd.sock
            malware    = *
            set acl_c_SPAM = 1
            message    = A virus has been detected ($malware_name).