I need help interpreting interactions between categorical factors in the logistic regression. 
I found sources that indicate that when the beta estimate is negative for an interaction A*B, this means that when A increases, the effect of B decreases. A positive beta means that when A increases, the effect of B increases.
Applying the above principle to the interaction marked yellow above, I would intepret it as follows: 
"When the the effect of B (Bact) on the success of the infection increases, the effect of W (Sick) on the succes of infection also increases.
Analysis of Penalized Maximum Likelihood Estimates									
Parameter			DF	Estimate	Standard	Wald	Pr > ChiSq	Exp(Est)	
					Error	Chi-Square			
Intercept			1	0.6849	0.2233	9.4079	0.0022	1.984	
Bact	B		1	-4.2516	0.6824	38.8127	<.0001	0.014	
Bact	C		1	-4.7737	0.8575	30.9943	<.0001	0.008	
Bact	D		1	0.1003	0.3186	0.0992	0.7528	1.106	
Bact	E		1	-1.5218	0.3202	22.581	<.0001	0.218	
Sick	W		1	-5.8833	1.4433	16.6169	<.0001	0.003	
Sick	X		1	-5.8833	1.4433	16.6169	<.0001	0.003	
Sick	Y		1	-5.8833	1.4433	16.6169	<.0001	0.003	
Sick	Z		1	-5.8833	1.4433	16.6169	<.0001	0.003	
Sick*Bact	B	W	1	10.2869	1.5974	41.4722	<.0001	29344.39	
Sick*Bact	B	X	1	7.4131	1.6148	21.0736	<.0001	1657.592	
Sick*Bact	B	Y	1	4.2516	2.1289	3.9886	0.0458	70.22	
Sick*Bact	B	Z	1	7.7024	1.6084	22.9344	<.0001	2213.687	
Sick*Bact	C	W	1	8.537	1.6852	25.6627	<.0001	5099.92	
Sick*Bact	C	X	1	7.6993	1.7028	20.4441	<.0001	2206.874	
Sick*Bact	C	Y	1	4.7737	2.1912	4.746	0.0294	118.355	
Sick*Bact	C	Z	1	5.8833	1.8584	10.0219	0.0015	358.989	
Sick*Bact	D	W	1	7.508	1.5105	24.7063	<.0001	1822.515	
Sick*Bact	D	X	1	2.9487	1.5012	3.8584	0.0495	19.081	
Sick*Bact	D	Y	1	6.9354	1.4928	21.5845	<.0001	1028.029	
Sick*Bact	D	Z	1	2.8253	1.5053	3.5228	0.0605	16.866	
Sick*Bact	E	W	1	4.5708	1.5015	9.2669	0.0023	96.625	
Sick*Bact	E	X	1	1.5218	2.0418	0.5555	0.4561	4.58	
Sick*Bact	E	Y	1	7.8934	1.4823	28.356	<.0001	2679.59	
Sick*Bact	E	Z	1	1.5218	2.0418	0.5555	0.4561	4.58	

However, I am not sure how to interpret the intercations with respect to the reference category. This further complicated by the fact that I have 5 categorical factors interacting with other 5 categorical factors. 
I am attaching an excel file with more information on this issue.
I hope you have time to help me. 
Than you,
Marcel