Table 2. Characteristics of 496 pneumonia patients tested for Acanthamoeba polyphaga mimivirus DNA*.

Setting or population	Sample size	Age group	Sample type	Location	Period	Other causes
Community-acquired pneumonia cases	124	Children<5 y	Nasal swabs	Urban USA	Oct 2000– Sep 2001	None detected
	120	Adults, children	NP swabs	Rural Thailand	Sep 2003– Aug 2004	None detected
Nosocomially acquired pneumonia outbreaks	23	Geriatric	NP/OP swabs	Retirement center, USA	Sep 2003	20% rhinovirus
	24	Geriatric	NP/OP swabs	Retirement center, USA	Jul–Aug 2002	20% rhinovirus
	24	Geriatric	Nasal swabs	Retirement center, USA	May 2004	50% hMPV
Community-acquired pneumonia outbreak	5	Adults, children	BAL, sputum, ET aspirate	Familial cluster, USA	Nov 2004	None detected
Bone marrow transplant recipients	42	Adults	NP aspirate	USA	Jan–Apr 2001	60% other respiratory viruses
	45	Adults	Nasal wash, NP swabs	USA	2003	10% influenza and picornaviruses
Lung transplant recipients	89	Adults	NP swabs	Canada	2002–2003	30% other respiratory viruses

*NP, nasopharyngeal; OP, oropharyngeal; hMPV, human metapneumovirus; BAL, bronchoalveolar lavage; ET, endotracheal.