Arthropods such as ticks, mites, fleas, and lice, can also cause human disease, which conceptually are similar to infections, but invasion of a human or animal body by these macroparasites is usually termed infestation. Prions (although they do not secrete toxins)

Signs and symptoms
The signs and symptoms of an infection depend on the type of disease. Some signs of infection affect the whole body generally, such as fatigue, loss of appetite, weight loss, fevers, night sweats, chills, aches and pains. Others are specific to individual body parts, such as skin rashes, coughing, or a runny nose.In certain cases, infectious diseases may be asymptomatic for much or even all of their course in a given host. In the latter case, the disease may only be defined as a "disease" (which by definition means an illness) in hosts who secondarily become ill after contact with an asymptomatic carrier. An infection is not synonymous with an infectious disease, as some infections do not cause illness in a host. Bacterial or viral
As bacterial and viral infections can both cause the same kinds of symptoms, it can be difficult to distinguish which is the cause of a specific infection. Distinguishing the two is important, since viral infections cannot be cured by antibiotics whereas bacterial infections can. Pathophysiology
There is a general chain of events that applies to infections, sometimes called the chain of infection. The chain of events involves several steps – which include the infectious agent, reservoir, entering a susceptible host, exit and transmission to new hosts.
Pacman dysplasia  is a lethal autosomal recessive skeletal dysplasia. The dysplasia is present during fetal development. References
Wilcox WR, Wenger DA, Lachman RS, Rimoin DL (2005). "Distinguishing Pacman dysplasia from mucolipidosis II: comment on Saul et al. [2005]". Am J Med Genet A. 135 (3): 333. doi:10.1002/ajmg.a.30717. PMID 15887286. S2CID 38848656. Saul RA, Proud V, Taylor HA, Leroy JG, Spranger J (2005). "Prenatal mucolipidosis type II (I-cell disease) can present as Pacman dysplasia". Am J Med Genet A. 135 (3): 328–32. doi:10.1002/ajmg.a.30716. PMID 15887289. S2CID 2151584. Wilcox WR, Lucas BC, Loebel B, Bachman RP, Lachman RS, Rimoin DL (1998). "Pacman dysplasia: report of two affected sibs". Am J Med Genet. 77 (4): 272–6. doi:10.1002/(SICI)1096-8628(19980526)77:4<272::AID-AJMG4>3.0.CO;2-P. PMID 9600734. Shohat M, Rimoin DL, Gruber HE, Lachman R (1993). "New epiphyseal stippling syndrome with osteoclastic hyperplasia". Am J Med Genet. 45 (5): 558–61. doi:10.1002/ajmg.1320450506. PMID 8456823. Miller SF, Proud VK, Werner AL, Field FM, Wilcox WF, Lachman RS, Rimoin DL (2003). "Pacman dysplasia: a lethal skeletal dysplasia with variable radiographic features". Pediatr Radiol. 33 (4): 256–60. doi:10.1007/s00247-002-0859-4. PMID 12709756. S2CID 185059. External links

Online Mendelian Inheritance in Man (OMIM): 167220