Table 3. Comparison of seasonal serological changes against the selected diseases in the layer monitored from 2015 to 2017

Disease	Geometric mean antibody titer ± Standard deviation
Disease	LPAI^a	ND^b	IB^c	aMPV^d	EDS’76^e	IBD^f	CIA^g	MS^h
Spring	4.22±1.64	6.63±1.32	3,548.17±2,227.77	8,108.05±6,771.51	4.34±1.34	7,253.00±4,144.45	2,094.39±2,529.40	4,896.20±3,756.45
Summer	4.32±1.64	6.81±1.35	3,412.69±2,100.60	7,999.45±5,293.14	4.68±1.48	4,329.65±1,707.67	1,766.67±2,170.61	4,602.74±3,265.55
Fall	4.29±1.59	6.66±1.34	3,409.63±2,107.12	6,547.02±6,841.00	4.21±1.48	6,737.37±2,561.37	1,731.31±1,650.40	4,247.52±3,803.97
Winter	4.20±1.55	6.61±1.34	3,682.74±1,990.03	7,137.51±5,997.39	3.96±1.41	6,024.10±3,106.38	1,744.85±1,715.69	5,146.29±3,013.63

LPAI, low pathogenic avian influenza; ND, Newcastle disease; IB, infectious bronchitis; aMPV, avian metapneumovirus infection; EDS’76, egg drop syndrome’ 76; IBD, infectious bursal disease; CIA, chicken infectious anemia; MS, Mycoplasma synoviae.